99991404 has 18 divisors (see below), whose sum is σ = 252756140. Its totient is φ = 33330456.

The previous prime is 99991387. The next prime is 99991447. The reversal of 99991404 is 40419999.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 99991404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1388734 + ... + 1388805.

Almost surely, 2^99991404 is an apocalyptic number.

It is an amenable number.

99991404 is an abundant number, since it is smaller than the sum of its proper divisors (152764736).

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

99991404 is a wasteful number, since it uses less digits than its factorization.

99991404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777549 (or 2777544 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 99991404 is about 9999.5701907632. The cubic root of 99991404 is about 464.1455832810.

The spelling of 99991404 in words is "ninety-nine million, nine hundred ninety-one thousand, four hundred four".