231890904 has 128 divisors (see below), whose sum is σ = 743808000. Its totient is φ = 65567232.

The previous prime is 231890887. The next prime is 231890909. The reversal of 231890904 is 409098132.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231890909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154992 + ... + 156480.

It is an arithmetic number, because the mean of its divisors is an integer number (5811000).

Almost surely, 2^231890904 is an apocalyptic number.

231890904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231890904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371904000).

231890904 is an abundant number, since it is smaller than the sum of its proper divisors (511917096).

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

231890904 is a wasteful number, since it uses less digits than its factorization.

231890904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 231890904 is about 15227.9645389658. The cubic root of 231890904 is about 614.3670346693.

The spelling of 231890904 in words is "two hundred thirty-one million, eight hundred ninety thousand, nine hundred four".