99638 has 16 divisors (see below), whose sum is σ = 186624. Its totient is φ = 38760.

The previous prime is 99623. The next prime is 99643. The reversal of 99638 is 83699.

It is a junction number, because it is equal to n+sod(n) for n = 99598 and 99607.

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, 170 + ... + 477.

It is an arithmetic number, because the mean of its divisors is an integer number (11664).

2⁹⁹⁶³⁸ is an apocalyptic number.

99638 is a deficient number, since it is larger than the sum of its proper divisors (86986).

99638 is a wasteful number, since it uses less digits than its factorization.

99638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its digits is 11664, while the sum is 35.

The square root of 99638 is about 315.6548748238. The cubic root of 99638 is about 46.3598121110.

It can be divided in two parts, 99 and 638, that added together give a palindrome (737).

The spelling of 99638 in words is "ninety-nine thousand, six hundred thirty-eight".