99919925 has 24 divisors (see below), whose sum is σ = 142252800. Its totient is φ = 68201280.

The previous prime is 99919921. The next prime is 99919949. The reversal of 99919925 is 52991999.

It is not a de Polignac number, because 99919925 - 2² = 99919921 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99919921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40631 + ... + 43019.

It is an arithmetic number, because the mean of its divisors is an integer number (5927200).

Almost surely, 2^99919925 is an apocalyptic number.

It is an amenable number.

99919925 is a deficient number, since it is larger than the sum of its proper divisors (42332875).

99919925 is a wasteful number, since it uses less digits than its factorization.

99919925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645 (or 2640 counting only the distinct ones).

The product of its digits is 590490, while the sum is 53.

The square root of 99919925 is about 9995.9954481782. The cubic root of 99919925 is about 464.0349585358.

The spelling of 99919925 in words is "ninety-nine million, nine hundred nineteen thousand, nine hundred twenty-five".