99121904 has 90 divisors (see below), whose sum is σ = 234516240. Its totient is φ = 40463808.

The previous prime is 99121901. The next prime is 99121909. The reversal of 99121904 is 40912199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 414617 + ... + 414855.

It is an arithmetic number, because the mean of its divisors is an integer number (2605736).

Almost surely, 2^99121904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99121904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117258120).

99121904 is an abundant number, since it is smaller than the sum of its proper divisors (135394336).

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

99121904 is a wasteful number, since it uses less digits than its factorization.

99121904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 99121904 is about 9955.9983929288. The cubic root of 99121904 is about 462.7963004196.

The spelling of 99121904 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred four".