231888638 has 16 divisors (see below), whose sum is σ = 351982176. Its totient is φ = 114566400.

The previous prime is 231888617. The next prime is 231888641. The reversal of 231888638 is 836888132.

It is a junction number, because it is equal to n+sod(n) for n = 231888592 and 231888601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122870 + ... + 124742.

It is an arithmetic number, because the mean of its divisors is an integer number (21998886).

Almost surely, 2^231888638 is an apocalyptic number.

231888638 is a deficient number, since it is larger than the sum of its proper divisors (120093538).

231888638 is a wasteful number, since it uses less digits than its factorization.

231888638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579.

The product of its digits is 442368, while the sum is 47.

The square root of 231888638 is about 15227.8901361942. The cubic root of 231888638 is about 614.3650334980.

The spelling of 231888638 in words is "two hundred thirty-one million, eight hundred eighty-eight thousand, six hundred thirty-eight".