31972629938 has 18 divisors (see below), whose sum is σ = 48808361439. Its totient is φ = 15708027132.

The previous prime is 31972629917. The next prime is 31972629959. The reversal of 31972629938 is 83992627913.

It is an interprime number because it is at equal distance from previous prime (31972629917) and next prime (31972629959).

It can be written as a sum of positive squares in only one way, i.e., 15986314969 + 15986314969 = 126437^2 + 126437^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=126437.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14918495 + ... + 14920637.

Almost surely, 2^31972629938 is an apocalyptic number.

31972629938 is a deficient number, since it is larger than the sum of its proper divisors (16835731501).

31972629938 is an frugal number, since it uses more digits than its factorization.

31972629938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406 (or 2204 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 59.

The spelling of 31972629938 in words is "thirty-one billion, nine hundred seventy-two million, six hundred twenty-nine thousand, nine hundred thirty-eight".