231992739 has 12 divisors (see below), whose sum is σ = 365564472. Its totient is φ = 140601600.

The previous prime is 231992737. The next prime is 231992753. The reversal of 231992739 is 937299132.

It is a happy number.

It is not a de Polignac number, because 231992739 - 2¹ = 231992737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231992694 and 231992703.

It is not an unprimeable number, because it can be changed into a prime (231992731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1171582 + ... + 1171779.

It is an arithmetic number, because the mean of its divisors is an integer number (30463706).

Almost surely, 2^231992739 is an apocalyptic number.

231992739 is a deficient number, since it is larger than the sum of its proper divisors (133571733).

231992739 is a wasteful number, since it uses less digits than its factorization.

231992739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343378 (or 2343375 counting only the distinct ones).

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

The square root of 231992739 is about 15231.3078558606. The cubic root of 231992739 is about 614.4569546989.

The spelling of 231992739 in words is "two hundred thirty-one million, nine hundred ninety-two thousand, seven hundred thirty-nine".