231990232 has 16 divisors (see below), whose sum is σ = 437498640. Its totient is φ = 115323936.

The previous prime is 231990223. The next prime is 231990251. The reversal of 231990232 is 232099132.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 231990194 and 231990203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82428 + ... + 85195.

It is an arithmetic number, because the mean of its divisors is an integer number (27343665).

Almost surely, 2^231990232 is an apocalyptic number.

It is an amenable number.

231990232 is a deficient number, since it is larger than the sum of its proper divisors (205508408).

231990232 is a wasteful number, since it uses less digits than its factorization.

231990232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167802 (or 167798 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 231990232 is about 15231.2255580436. The cubic root of 231990232 is about 614.4547413406.

Subtracting 231990232 from its reverse (232099132), we obtain a square (108900 = 330²).

The spelling of 231990232 in words is "two hundred thirty-one million, nine hundred ninety thousand, two hundred thirty-two".