15240440 has 16 divisors (see below), whose sum is σ = 34291080. Its totient is φ = 6096160.

The previous prime is 15240439. The next prime is 15240497. The reversal of 15240440 is 4404251.

15240440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15240440² = 464542022787200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190466 + ... + 190545.

Almost surely, 2^15240440 is an apocalyptic number.

15240440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15240440 is an abundant number, since it is smaller than the sum of its proper divisors (19050640).

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

15240440 is a wasteful number, since it uses less digits than its factorization.

15240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381022 (or 381018 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 15240440 is about 3903.9006134890. The cubic root of 15240440 is about 247.9319532352.

Adding to 15240440 its reverse (4404251), we get a palindrome (19644691).

The spelling of 15240440 in words is "fifteen million, two hundred forty thousand, four hundred forty".