231400138 has 4 divisors (see below), whose sum is σ = 347100210. Its totient is φ = 115700068.

The previous prime is 231400121. The next prime is 231400153. The reversal of 231400138 is 831004132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 194518809 + 36881329 = 13947^2 + 6073^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57850033 + ... + 57850036.

Almost surely, 2^231400138 is an apocalyptic number.

231400138 is a deficient number, since it is larger than the sum of its proper divisors (115700072).

231400138 is a wasteful number, since it uses less digits than its factorization.

231400138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115700071.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 231400138 is about 15211.8420317856. The cubic root of 231400138 is about 613.9333200798.

The spelling of 231400138 in words is "two hundred thirty-one million, four hundred thousand, one hundred thirty-eight".