99909404 has 72 divisors (see below), whose sum is σ = 213534720. Its totient is φ = 40042080.

The previous prime is 99909367. The next prime is 99909419. The reversal of 99909404 is 40490999.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1264637 + ... + 1264715.

It is an arithmetic number, because the mean of its divisors is an integer number (2965760).

Almost surely, 2^99909404 is an apocalyptic number.

99909404 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99909404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106767360).

99909404 is an abundant number, since it is smaller than the sum of its proper divisors (113625316).

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

99909404 is a wasteful number, since it uses less digits than its factorization.

99909404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 99909404 is about 9995.4691735806. The cubic root of 99909404 is about 464.0186712166.

The spelling of 99909404 in words is "ninety-nine million, nine hundred nine thousand, four hundred four".