99939777 has 16 divisors (see below), whose sum is σ = 154787712. Its totient is φ = 56171520.

The previous prime is 99939773. The next prime is 99939797. The reversal of 99939777 is 77793999.

It is not a de Polignac number, because 99939777 - 2² = 99939773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99939777.

It is not an unprimeable number, because it can be changed into a prime (99939773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37728 + ... + 40289.

It is an arithmetic number, because the mean of its divisors is an integer number (9674232).

Almost surely, 2^99939777 is an apocalyptic number.

It is an amenable number.

99939777 is a deficient number, since it is larger than the sum of its proper divisors (54847935).

99939777 is a wasteful number, since it uses less digits than its factorization.

99939777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78088.

The product of its digits is 6751269, while the sum is 60.

The square root of 99939777 is about 9996.9883965122. The cubic root of 99939777 is about 464.0656878490.

The spelling of 99939777 in words is "ninety-nine million, nine hundred thirty-nine thousand, seven hundred seventy-seven".