99639930 has 32 divisors (see below), whose sum is σ = 257531904. Its totient is φ = 24526656.

The previous prime is 99639929. The next prime is 99639931. The reversal of 99639930 is 3993699.

It is an interprime number because it is at equal distance from previous prime (99639929) and next prime (99639931).

It is a self number, because there is not a number n which added to its sum of digits gives 99639930.

It is not an unprimeable number, because it can be changed into a prime (99639931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127354 + ... + 128133.

It is an arithmetic number, because the mean of its divisors is an integer number (8047872).

Almost surely, 2^99639930 is an apocalyptic number.

99639930 is an abundant number, since it is smaller than the sum of its proper divisors (157891974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99639930 is a wasteful number, since it uses less digits than its factorization.

99639930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255510.

The product of its (nonzero) digits is 354294, while the sum is 48.

The square root of 99639930 is about 9981.9802644565. The cubic root of 99639930 is about 463.6011144080.

The spelling of 99639930 in words is "ninety-nine million, six hundred thirty-nine thousand, nine hundred thirty".