99121938 has 16 divisors (see below), whose sum is σ = 198819360. Its totient is φ = 32944736.

The previous prime is 99121937. The next prime is 99121949. The reversal of 99121938 is 83912199.

It is a self number, because there is not a number n which added to its sum of digits gives 99121938.

It is not an unprimeable number, because it can be changed into a prime (99121931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21723 + ... + 25886.

It is an arithmetic number, because the mean of its divisors is an integer number (12426210).

Almost surely, 2^99121938 is an apocalyptic number.

99121938 is an abundant number, since it is smaller than the sum of its proper divisors (99697422).

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

99121938 is a wasteful number, since it uses less digits than its factorization.

99121938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47961.

The product of its digits is 34992, while the sum is 42.

The square root of 99121938 is about 9956.0001004419. Note that the first 3 decimals coincide. The cubic root of 99121938 is about 462.7963533345.

The spelling of 99121938 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred thirty-eight".