231839220 has 24 divisors (see below), whose sum is σ = 649149984. Its totient is φ = 61823776.

The previous prime is 231839219. The next prime is 231839243. The reversal of 231839220 is 22938132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1931934 + ... + 1932053.

It is an arithmetic number, because the mean of its divisors is an integer number (27047916).

Almost surely, 2^231839220 is an apocalyptic number.

231839220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231839220 is an abundant number, since it is smaller than the sum of its proper divisors (417310764).

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

231839220 is a wasteful number, since it uses less digits than its factorization.

231839220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863999 (or 3863997 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 231839220 is about 15226.2674349297. The cubic root of 231839220 is about 614.3213877658.

The spelling of 231839220 in words is "two hundred thirty-one million, eight hundred thirty-nine thousand, two hundred twenty".