99979965 has 48 divisors (see below), whose sum is σ = 187125120. Its totient is φ = 49230720.

The previous prime is 99979963. The next prime is 99979967. The reversal of 99979965 is 56997999.

It is an interprime number because it is at equal distance from previous prime (99979963) and next prime (99979967).

It is not a de Polignac number, because 99979965 - 2¹ = 99979963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99979961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28350 + ... + 31680.

It is an arithmetic number, because the mean of its divisors is an integer number (3898440).

Almost surely, 2^99979965 is an apocalyptic number.

It is an amenable number.

99979965 is a deficient number, since it is larger than the sum of its proper divisors (87145155).

99979965 is a wasteful number, since it uses less digits than its factorization.

99979965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394 (or 3391 counting only the distinct ones).

The product of its digits is 12400290, while the sum is 63.

The square root of 99979965 is about 9998.9981998198. The cubic root of 99979965 is about 464.1278832135.

The spelling of 99979965 in words is "ninety-nine million, nine hundred seventy-nine thousand, nine hundred sixty-five".