99139687438 has 16 divisors (see below), whose sum is σ = 162276825600. Its totient is φ = 45050092600.

The previous prime is 99139687403. The next prime is 99139687483. The reversal of 99139687438 is 83478693199.

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, 594238 + ... + 742561.

It is an arithmetic number, because the mean of its divisors is an integer number (10142301600).

Almost surely, 2^99139687438 is an apocalyptic number.

99139687438 is a deficient number, since it is larger than the sum of its proper divisors (63137138162).

99139687438 is a wasteful number, since it uses less digits than its factorization.

99139687438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340183.

The product of its digits is 70543872, while the sum is 67.

The spelling of 99139687438 in words is "ninety-nine billion, one hundred thirty-nine million, six hundred eighty-seven thousand, four hundred thirty-eight".