15972313 has 8 divisors (see below), whose sum is σ = 18432128. Its totient is φ = 13557024.

The previous prime is 15972287. The next prime is 15972317. The reversal of 15972313 is 31327951.

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 15972313 - 2¹³ = 15964121 is a prime.

It is a super-2 number, since 2×15972313² = 510229565139938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15972317) 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, 10356 + ... + 11797.

It is an arithmetic number, because the mean of its divisors is an integer number (2304016).

Almost surely, 2^15972313 is an apocalyptic number.

It is an amenable number.

15972313 is a deficient number, since it is larger than the sum of its proper divisors (2459815).

15972313 is a wasteful number, since it uses less digits than its factorization.

15972313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22263.

The product of its digits is 5670, while the sum is 31.

The square root of 15972313 is about 3996.5376264962. The cubic root of 15972313 is about 251.8387784178.

The spelling of 15972313 in words is "fifteen million, nine hundred seventy-two thousand, three hundred thirteen".