231930018 has 12 divisors (see below), whose sum is σ = 502515078. Its totient is φ = 77310000.

The previous prime is 231930011. The next prime is 231930019. The reversal of 231930018 is 810039132.

It can be written as a sum of positive squares in only one way, i.e., 197037369 + 34892649 = 14037^2 + 5907^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231929973 and 231930000.

It is not an unprimeable number, because it can be changed into a prime (231930011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6442483 + ... + 6442518.

Almost surely, 2^231930018 is an apocalyptic number.

231930018 is an abundant number, since it is smaller than the sum of its proper divisors (270585060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231930018 is a wasteful number, since it uses less digits than its factorization.

231930018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12885009 (or 12885006 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 231930018 is about 15229.2487667646. The cubic root of 231930018 is about 614.4015753388.

The spelling of 231930018 in words is "two hundred thirty-one million, nine hundred thirty thousand, eighteen".