99439972 has 6 divisors (see below), whose sum is σ = 174019958. Its totient is φ = 49719984.

The previous prime is 99439961. The next prime is 99439997. The reversal of 99439972 is 27993499.

It can be written as a sum of positive squares in only one way, i.e., 76457536 + 22982436 = 8744^2 + 4794^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12429993 + ... + 12430000.

Almost surely, 2^99439972 is an apocalyptic number.

It is an amenable number.

99439972 is a deficient number, since it is larger than the sum of its proper divisors (74579986).

99439972 is a wasteful number, since it uses less digits than its factorization.

99439972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24859997 (or 24859995 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 52.

The square root of 99439972 is about 9971.9592859177. The cubic root of 99439972 is about 463.2907875753.

The spelling of 99439972 in words is "ninety-nine million, four hundred thirty-nine thousand, nine hundred seventy-two".