99938638 has 8 divisors (see below), whose sum is σ = 153097632. Its totient is φ = 48906096.

The previous prime is 99938633. The next prime is 99938647. The reversal of 99938638 is 83683999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99938633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531495 + ... + 531682.

It is an arithmetic number, because the mean of its divisors is an integer number (19137204).

Almost surely, 2^99938638 is an apocalyptic number.

99938638 is a deficient number, since it is larger than the sum of its proper divisors (53158994).

99938638 is a wasteful number, since it uses less digits than its factorization.

99938638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063226.

The product of its digits is 2519424, while the sum is 55.

The square root of 99938638 is about 9996.9314291937. The cubic root of 99938638 is about 464.0639248778.

It can be divided in two parts, 99938 and 638, that added together give a triangular number (100576 = T₄₄₈).

The spelling of 99938638 in words is "ninety-nine million, nine hundred thirty-eight thousand, six hundred thirty-eight".