231143400 has 72 divisors (see below), whose sum is σ = 776262630. Its totient is φ = 61637760.

The previous prime is 231143387. The next prime is 231143443. The reversal of 231143400 is 4341132.

231143400 is a `hidden beast` number, since 231 + 1 + 434 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 188293284 + 42850116 = 13722^2 + 6546^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 62407 + ... + 66006.

Almost surely, 2^231143400 is an apocalyptic number.

231143400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231143400 is an abundant number, since it is smaller than the sum of its proper divisors (545119230).

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

231143400 is a wasteful number, since it uses less digits than its factorization.

231143400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128435 (or 128423 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231143400 is about 15203.4009353171. The cubic root of 231143400 is about 613.7061834510.

Adding to 231143400 its reverse (4341132), we get a palindrome (235484532).

The spelling of 231143400 in words is "two hundred thirty-one million, one hundred forty-three thousand, four hundred".