15240978 has 12 divisors (see below), whose sum is σ = 33022158. Its totient is φ = 5080320.

The previous prime is 15240977. The next prime is 15240997. The reversal of 15240978 is 87904251.

It can be written as a sum of positive squares in only one way, i.e., 15233409 + 7569 = 3903^2 + 87^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (15240977) 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 5 ways as a sum of consecutive naturals, for example, 423343 + ... + 423378.

Almost surely, 2^15240978 is an apocalyptic number.

15240978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15240978 is an abundant number, since it is smaller than the sum of its proper divisors (17781180).

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

15240978 is a wasteful number, since it uses less digits than its factorization.

15240978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846729 (or 846726 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 15240978 is about 3903.9695183236. The cubic root of 15240978 is about 247.9348706011.

The spelling of 15240978 in words is "fifteen million, two hundred forty thousand, nine hundred seventy-eight".