231913890 has 96 divisors (see below), whose sum is σ = 652317120. Its totient is φ = 56827008.

The previous prime is 231913861. The next prime is 231913931. The reversal of 231913890 is 98319132.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 443169 + ... + 443691.

It is an arithmetic number, because the mean of its divisors is an integer number (6794970).

Almost surely, 2^231913890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231913890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326158560).

231913890 is an abundant number, since it is smaller than the sum of its proper divisors (420403230).

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

231913890 is a wasteful number, since it uses less digits than its factorization.

231913890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 231913890 is about 15228.7192501536. The cubic root of 231913890 is about 614.3873335452.

The spelling of 231913890 in words is "two hundred thirty-one million, nine hundred thirteen thousand, eight hundred ninety".