231971400 has 72 divisors (see below), whose sum is σ = 779043330. Its totient is φ = 61858560.

The previous prime is 231971387. The next prime is 231971423. The reversal of 231971400 is 4179132.

231971400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 196616484 + 35354916 = 14022^2 + 5946^2 .

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

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, 62637 + ... + 66236.

Almost surely, 2^231971400 is an apocalyptic number.

231971400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231971400 is an abundant number, since it is smaller than the sum of its proper divisors (547071930).

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

231971400 is a wasteful number, since it uses less digits than its factorization.

231971400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128895 (or 128883 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 231971400 is about 15230.6073417970. The cubic root of 231971400 is about 614.4381145992.

The spelling of 231971400 in words is "two hundred thirty-one million, nine hundred seventy-one thousand, four hundred".