17972157 has 32 divisors (see below), whose sum is σ = 29777920. Its totient is φ = 9408960.

The previous prime is 17972153. The next prime is 17972173. The reversal of 17972157 is 75127971.

It is not a de Polignac number, because 17972157 - 2² = 17972153 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17972153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11643 + ... + 13095.

It is an arithmetic number, because the mean of its divisors is an integer number (930560).

Almost surely, 2^17972157 is an apocalyptic number.

It is an amenable number.

17972157 is a deficient number, since it is larger than the sum of its proper divisors (11805763).

17972157 is a wasteful number, since it uses less digits than its factorization.

17972157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513.

The product of its digits is 30870, while the sum is 39.

The square root of 17972157 is about 4239.3580882016. The cubic root of 17972157 is about 261.9389413491.

The spelling of 17972157 in words is "seventeen million, nine hundred seventy-two thousand, one hundred fifty-seven".