15420040 has 16 divisors (see below), whose sum is σ = 34695180. Its totient is φ = 6168000.

The previous prime is 15420017. The next prime is 15420043. The reversal of 15420040 is 4002451.

It can be written as a sum of positive squares in 2 ways, for example, as 15007876 + 412164 = 3874^2 + 642^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15419996 and 15420023.

It is not an unprimeable number, because it can be changed into a prime (15420043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192711 + ... + 192790.

Almost surely, 2^15420040 is an apocalyptic number.

15420040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15420040 is an abundant number, since it is smaller than the sum of its proper divisors (19275140).

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

15420040 is a wasteful number, since it uses less digits than its factorization.

15420040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385512 (or 385508 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 15420040 is about 3926.8358763768. The cubic root of 15420040 is about 248.9020652156.

Adding to 15420040 its reverse (4002451), we get a palindrome (19422491).

The spelling of 15420040 in words is "fifteen million, four hundred twenty thousand, forty".