231400280 has 32 divisors (see below), whose sum is σ = 538606800. Its totient is φ = 89367936.

The previous prime is 231400249. The next prime is 231400283. The reversal of 231400280 is 82004132.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231400283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98582 + ... + 100901.

Almost surely, 2^231400280 is an apocalyptic number.

231400280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231400280 is an abundant number, since it is smaller than the sum of its proper divisors (307206520).

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

231400280 is a wasteful number, since it uses less digits than its factorization.

231400280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199523 (or 199519 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 231400280 is about 15211.8466992013. The cubic root of 231400280 is about 613.9334456610.

The spelling of 231400280 in words is "two hundred thirty-one million, four hundred thousand, two hundred eighty".