99979967 has 2 divisors, whose sum is σ = 99979968. Its totient is φ = 99979966.

The previous prime is 99979963. The next prime is 99979981. The reversal of 99979967 is 76997999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99979967 - 2² = 99979963 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99979961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49989983 + 49989984.

It is an arithmetic number, because the mean of its divisors is an integer number (49989984).

Almost surely, 2^99979967 is an apocalyptic number.

99979967 is a deficient number, since it is larger than the sum of its proper divisors (1).

99979967 is an equidigital number, since it uses as much as digits as its factorization.

99979967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17360406, while the sum is 65.

The square root of 99979967 is about 9998.9982998298. The cubic root of 99979967 is about 464.1278863083.

The spelling of 99979967 in words is "ninety-nine million, nine hundred seventy-nine thousand, nine hundred sixty-seven".