99991994 has 16 divisors (see below), whose sum is σ = 165716928. Its totient is φ = 45008832.

The previous prime is 99991987. The next prime is 99991999. The reversal of 99991994 is 49919999.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99991999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63152 + ... + 64715.

It is an arithmetic number, because the mean of its divisors is an integer number (10357308).

Almost surely, 2^99991994 is an apocalyptic number.

99991994 is a deficient number, since it is larger than the sum of its proper divisors (65724934).

99991994 is a wasteful number, since it uses less digits than its factorization.

99991994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127909.

The product of its digits is 2125764, while the sum is 59.

The square root of 99991994 is about 9999.5996919877. The cubic root of 99991994 is about 464.1464961773.

The spelling of 99991994 in words is "ninety-nine million, nine hundred ninety-one thousand, nine hundred ninety-four".