231666140 has 24 divisors (see below), whose sum is σ = 515117232. Its totient is φ = 87215360.

The previous prime is 231666137. The next prime is 231666173. The reversal of 231666140 is 41666132.

It is a happy number.

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, 340346 + ... + 341025.

It is an arithmetic number, because the mean of its divisors is an integer number (21463218).

Almost surely, 2^231666140 is an apocalyptic number.

231666140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231666140 is an abundant number, since it is smaller than the sum of its proper divisors (283451092).

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

231666140 is a wasteful number, since it uses less digits than its factorization.

231666140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681397 (or 681395 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 231666140 is about 15220.5827746509. The cubic root of 231666140 is about 614.1684754497.

The spelling of 231666140 in words is "two hundred thirty-one million, six hundred sixty-six thousand, one hundred forty".