99231638 has 16 divisors (see below), whose sum is σ = 163872720. Its totient is φ = 44690400.

The previous prime is 99231631. The next prime is 99231647. The reversal of 99231638 is 83613299.

It is a junction number, because it is equal to n+sod(n) for n = 99231595 and 99231604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99231631) 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, 18293 + ... + 23088.

It is an arithmetic number, because the mean of its divisors is an integer number (10242045).

Almost surely, 2^99231638 is an apocalyptic number.

99231638 is a deficient number, since it is larger than the sum of its proper divisors (64641082).

99231638 is a wasteful number, since it uses less digits than its factorization.

99231638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41503.

The product of its digits is 69984, while the sum is 41.

The square root of 99231638 is about 9961.5078175947. The cubic root of 99231638 is about 462.9670186907.

It can be divided in two parts, 99231 and 638, that multiplied together give a triangular number (63309378 = T₁₁₂₅₂).

The spelling of 99231638 in words is "ninety-nine million, two hundred thirty-one thousand, six hundred thirty-eight".