231391400 has 48 divisors (see below), whose sum is σ = 539279100. Its totient is φ = 92334080.

The previous prime is 231391399. The next prime is 231391411. The reversal of 231391400 is 4193132.

It can be written as a sum of positive squares in 6 ways, for example, as 171452836 + 59938564 = 13094^2 + 7742^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100664 + ... + 102936.

Almost surely, 2^231391400 is an apocalyptic number.

231391400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231391400 is an abundant number, since it is smaller than the sum of its proper divisors (307887700).

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

231391400 is a wasteful number, since it uses less digits than its factorization.

231391400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798 (or 2789 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 231391400 is about 15211.5548186239. The cubic root of 231391400 is about 613.9255923159.

The spelling of 231391400 in words is "two hundred thirty-one million, three hundred ninety-one thousand, four hundred".