99939969 has 12 divisors (see below), whose sum is σ = 145980900. Its totient is φ = 65877504.

The previous prime is 99939967. The next prime is 99940007. The reversal of 99939969 is 96993999.

It can be written as a sum of positive squares in 2 ways, for example, as 40449600 + 59490369 = 6360^2 + 7713^2 .

It is not a de Polignac number, because 99939969 - 2¹ = 99939967 is a prime.

It is a super-2 number, since 2×99939969² = 19975994807441922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99939967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61584 + ... + 63185.

It is an arithmetic number, because the mean of its divisors is an integer number (12165075).

Almost surely, 2^99939969 is an apocalyptic number.

It is an amenable number.

99939969 is a deficient number, since it is larger than the sum of its proper divisors (46040931).

99939969 is a wasteful number, since it uses less digits than its factorization.

99939969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124864 (or 124861 counting only the distinct ones).

The product of its digits is 9565938, while the sum is 63.

The square root of 99939969 is about 9996.9979993996. The cubic root of 99939969 is about 464.0659850298.

The spelling of 99939969 in words is "ninety-nine million, nine hundred thirty-nine thousand, nine hundred sixty-nine".