99991992 has 16 divisors (see below), whose sum is σ = 249980040. Its totient is φ = 33330656.

The previous prime is 99991987. The next prime is 99991999. The reversal of 99991992 is 29919999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99991999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083143 + ... + 2083190.

Almost surely, 2^99991992 is an apocalyptic number.

It is an amenable number.

99991992 is an abundant number, since it is smaller than the sum of its proper divisors (149988048).

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

99991992 is a wasteful number, since it uses less digits than its factorization.

99991992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166342 (or 4166338 counting only the distinct ones).

The product of its digits is 1062882, while the sum is 57.

The square root of 99991992 is about 9999.5995919837. The cubic root of 99991992 is about 464.1464930827.

The spelling of 99991992 in words is "ninety-nine million, nine hundred ninety-one thousand, nine hundred ninety-two".