99423891 has 36 divisors (see below), whose sum is σ = 168432264. Its totient is φ = 56347200.

The previous prime is 99423859. The next prime is 99423899. The reversal of 99423891 is 19832499.

It is not a de Polignac number, because 99423891 - 2⁵ = 99423859 is a prime.

It is a super-2 number, since 2×99423891² = 19770220203159762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99423899) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56911 + ... + 58631.

It is an arithmetic number, because the mean of its divisors is an integer number (4678674).

Almost surely, 2^99423891 is an apocalyptic number.

99423891 is a deficient number, since it is larger than the sum of its proper divisors (69008373).

99423891 is a wasteful number, since it uses less digits than its factorization.

99423891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872 (or 1862 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 99423891 is about 9971.1529423633. The cubic root of 99423891 is about 463.2658124382.

The spelling of 99423891 in words is "ninety-nine million, four hundred twenty-three thousand, eight hundred ninety-one".