231972939 has 48 divisors (see below), whose sum is σ = 389132640. Its totient is φ = 131604480.

The previous prime is 231972931. The next prime is 231972959. The reversal of 231972939 is 939279132.

It is a happy number.

231972939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231972939 - 2³ = 231972931 is a prime.

It is a super-2 number, since 2×231972939² = 107622888856595442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231972894 and 231972903.

It is not an unprimeable number, because it can be changed into a prime (231972931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 566967 + ... + 567375.

It is an arithmetic number, because the mean of its divisors is an integer number (8106930).

Almost surely, 2^231972939 is an apocalyptic number.

231972939 is a deficient number, since it is larger than the sum of its proper divisors (157159701).

231972939 is a wasteful number, since it uses less digits than its factorization.

231972939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 777 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 231972939 is about 15230.6578649775. The cubic root of 231972939 is about 614.4394734135.

The spelling of 231972939 in words is "two hundred thirty-one million, nine hundred seventy-two thousand, nine hundred thirty-nine".