99989997 has 4 divisors (see below), whose sum is σ = 133320000. Its totient is φ = 66659996.

The previous prime is 99989983. The next prime is 99990001. The reversal of 99989997 is 79998999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99989997 - 2¹⁴ = 99973613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99989497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16664997 + ... + 16665002.

It is an arithmetic number, because the mean of its divisors is an integer number (33330000).

Almost surely, 2^99989997 is an apocalyptic number.

It is an amenable number.

99989997 is a deficient number, since it is larger than the sum of its proper divisors (33330003).

99989997 is a wasteful number, since it uses less digits than its factorization.

99989997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33330002.

The product of its digits is 29760696, while the sum is 69.

The square root of 99989997 is about 9999.4998374919. The cubic root of 99989997 is about 464.1434062408.

The spelling of 99989997 in words is "ninety-nine million, nine hundred eighty-nine thousand, nine hundred ninety-seven".