15402420 has 96 divisors (see below), whose sum is σ = 52295040. Its totient is φ = 3732480.

The previous prime is 15402419. The next prime is 15402421. The reversal of 15402420 is 2420451.

15402420 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15402419) and next prime (15402421).

It is a Harshad number since it is a multiple of its sum of digits (18).

15402420 is a modest number, since divided by 2420 gives 1540 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 15402393 and 15402402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15402421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4644 + ... + 7236.

It is an arithmetic number, because the mean of its divisors is an integer number (544740).

Almost surely, 2^15402420 is an apocalyptic number.

15402420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15402420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26147520).

15402420 is an abundant number, since it is smaller than the sum of its proper divisors (36892620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15402420 is a wasteful number, since it uses less digits than its factorization.

15402420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622 (or 2614 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 15402420 is about 3924.5916985083. The cubic root of 15402420 is about 248.8072248671.

Adding to 15402420 its reverse (2420451), we get a palindrome (17822871).

The spelling of 15402420 in words is "fifteen million, four hundred two thousand, four hundred twenty".