231927990 has 64 divisors (see below), whose sum is σ = 638945280. Its totient is φ = 52778880.

The previous prime is 231927989. The next prime is 231928009. The reversal of 231927990 is 99729132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47880 + ... + 52500.

It is an arithmetic number, because the mean of its divisors is an integer number (9983520).

Almost surely, 2^231927990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231927990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319472640).

231927990 is an abundant number, since it is smaller than the sum of its proper divisors (407017290).

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

231927990 is a wasteful number, since it uses less digits than its factorization.

231927990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4877.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 231927990 is about 15229.1821842146. The cubic root of 231927990 is about 614.3997845543.

The spelling of 231927990 in words is "two hundred thirty-one million, nine hundred twenty-seven thousand, nine hundred ninety".