15423940 has 72 divisors (see below), whose sum is σ = 38630592. Its totient is φ = 5066880.

The previous prime is 15423929. The next prime is 15423949. The reversal of 15423940 is 4932451.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 15423899 and 15423908.

It is not an unprimeable number, because it can be changed into a prime (15423949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117675 + ... + 117805.

It is an arithmetic number, because the mean of its divisors is an integer number (536536).

Almost surely, 2^15423940 is an apocalyptic number.

15423940 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 15423940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19315296).

15423940 is an abundant number, since it is smaller than the sum of its proper divisors (23206652).

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

15423940 is a wasteful number, since it uses less digits than its factorization.

15423940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 15423940 is about 3927.3324279974. The cubic root of 15423940 is about 248.9230473537.

The spelling of 15423940 in words is "fifteen million, four hundred twenty-three thousand, nine hundred forty".