31972893 has 8 divisors (see below), whose sum is σ = 42902688. Its totient is φ = 21179184.

The previous prime is 31972883. The next prime is 31972901. The reversal of 31972893 is 39827913.

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

It is a de Polignac number, because none of the positive numbers 2^k-31972893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31972813) 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, 33471 + ... + 34412.

It is an arithmetic number, because the mean of its divisors is an integer number (5362836).

Almost surely, 2^31972893 is an apocalyptic number.

It is an amenable number.

31972893 is a deficient number, since it is larger than the sum of its proper divisors (10929795).

31972893 is a wasteful number, since it uses less digits than its factorization.

31972893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68043.

The product of its digits is 81648, while the sum is 42.

The square root of 31972893 is about 5654.4577989406. The cubic root of 31972893 is about 317.3905399018.

The spelling of 31972893 in words is "thirty-one million, nine hundred seventy-two thousand, eight hundred ninety-three".