99638139 has 32 divisors (see below), whose sum is σ = 147930624. Its totient is φ = 59333120.

The previous prime is 99638137. The next prime is 99638153. The reversal of 99638139 is 93183699.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 99638139 - 2¹ = 99638137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99638131) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 202684 + ... + 203174.

It is an arithmetic number, because the mean of its divisors is an integer number (4622832).

Almost surely, 2^99638139 is an apocalyptic number.

99638139 is a deficient number, since it is larger than the sum of its proper divisors (48292485).

99638139 is a wasteful number, since it uses less digits than its factorization.

99638139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707.

The product of its digits is 314928, while the sum is 48.

The square root of 99638139 is about 9981.8905523954. The cubic root of 99638139 is about 463.5983366910.

The spelling of 99638139 in words is "ninety-nine million, six hundred thirty-eight thousand, one hundred thirty-nine".