31983957 has 16 divisors (see below), whose sum is σ = 47472000. Its totient is φ = 21282912.

The previous prime is 31983949. The next prime is 31983983. The reversal of 31983957 is 75938913.

It is a happy number.

It is not a de Polignac number, because 31983957 - 2³ = 31983949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31983937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24169 + ... + 25457.

It is an arithmetic number, because the mean of its divisors is an integer number (2967000).

Almost surely, 2^31983957 is an apocalyptic number.

It is an amenable number.

31983957 is a deficient number, since it is larger than the sum of its proper divisors (15488043).

31983957 is a wasteful number, since it uses less digits than its factorization.

31983957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217 (or 2211 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 31983957 is about 5655.4360574583. The cubic root of 31983957 is about 317.4271459517.

The spelling of 31983957 in words is "thirty-one million, nine hundred eighty-three thousand, nine hundred fifty-seven".