15725040 has 40 divisors (see below), whose sum is σ = 48748368. Its totient is φ = 4193280.

The previous prime is 15725023. The next prime is 15725053. The reversal of 15725040 is 4052751.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 15725040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32521 + ... + 33000.

Almost surely, 2^15725040 is an apocalyptic number.

15725040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15725040 is an abundant number, since it is smaller than the sum of its proper divisors (33023328).

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

15725040 is a wasteful number, since it uses less digits than its factorization.

15725040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65537 (or 65531 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 15725040 is about 3965.4810553072. The cubic root of 15725040 is about 250.5324120116.

Adding to 15725040 its reverse (4052751), we get a palindrome (19777791).

The spelling of 15725040 in words is "fifteen million, seven hundred twenty-five thousand, forty".