99009992 has 8 divisors (see below), whose sum is σ = 185643750. Its totient is φ = 49504992.

The previous prime is 99009991. The next prime is 99010019. The reversal of 99009992 is 29990099.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 81252196 + 17757796 = 9014^2 + 4214^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (99009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6188117 + ... + 6188132.

Almost surely, 2^99009992 is an apocalyptic number.

It is an amenable number.

99009992 is a deficient number, since it is larger than the sum of its proper divisors (86633758).

99009992 is a wasteful number, since it uses less digits than its factorization.

99009992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12376255 (or 12376251 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 99009992 is about 9950.3764752898. The cubic root of 99009992 is about 462.6220639104.

It can be divided in two parts, 99009 and 992, that added together give a palindrome (100001).

The spelling of 99009992 in words is "ninety-nine million, nine thousand, nine hundred ninety-two".