15725397 has 8 divisors (see below), whose sum is σ = 21175200. Its totient is φ = 10379600.

The previous prime is 15725393. The next prime is 15725443. The reversal of 15725397 is 79352751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15725397 - 2² = 15725393 is a prime.

It is a super-2 number, since 2×15725397² = 494576221615218, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15725393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25647 + ... + 26252.

It is an arithmetic number, because the mean of its divisors is an integer number (2646900).

Almost surely, 2^15725397 is an apocalyptic number.

It is an amenable number.

15725397 is a deficient number, since it is larger than the sum of its proper divisors (5449803).

15725397 is a wasteful number, since it uses less digits than its factorization.

15725397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52003.

The product of its digits is 66150, while the sum is 39.

The square root of 15725397 is about 3965.5260685059. The cubic root of 15725397 is about 250.5343079134.

The spelling of 15725397 in words is "fifteen million, seven hundred twenty-five thousand, three hundred ninety-seven".