15972638 has 16 divisors (see below), whose sum is σ = 26199936. Its totient is φ = 7242840.

The previous prime is 15972637. The next prime is 15972647. The reversal of 15972638 is 83627951.

It is a junction number, because it is equal to n+sod(n) for n = 15972595 and 15972604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15972631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14495 + ... + 15557.

It is an arithmetic number, because the mean of its divisors is an integer number (1637496).

Almost surely, 2^15972638 is an apocalyptic number.

15972638 is a deficient number, since it is larger than the sum of its proper divisors (10227298).

15972638 is a wasteful number, since it uses less digits than its factorization.

15972638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759.

The product of its digits is 90720, while the sum is 41.

The square root of 15972638 is about 3996.5782864846. The cubic root of 15972638 is about 251.8404865204.

The spelling of 15972638 in words is "fifteen million, nine hundred seventy-two thousand, six hundred thirty-eight".