231309890 has 48 divisors (see below), whose sum is σ = 485782272. Its totient is φ = 79069536.

The previous prime is 231309847. The next prime is 231309893. The reversal of 231309890 is 98903132.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 231309890.

It is not an unprimeable number, because it can be changed into a prime (231309893) 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 23 ways as a sum of consecutive naturals, for example, 267599 + ... + 268461.

It is an arithmetic number, because the mean of its divisors is an integer number (10120464).

Almost surely, 2^231309890 is an apocalyptic number.

231309890 is an abundant number, since it is smaller than the sum of its proper divisors (254472382).

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

231309890 is a wasteful number, since it uses less digits than its factorization.

231309890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 231309890 is about 15208.8753693362. The cubic root of 231309890 is about 613.8534966488.

The spelling of 231309890 in words is "two hundred thirty-one million, three hundred nine thousand, eight hundred ninety".