18099925 has 6 divisors (see below), whose sum is σ = 22443938. Its totient is φ = 14479920.

The previous prime is 18099869. The next prime is 18099929. The reversal of 18099925 is 52999081.

It can be written as a sum of positive squares in 3 ways, for example, as 4726276 + 13373649 = 2174^2 + 3657^2 .

It is not a de Polignac number, because 18099925 - 2²¹ = 16002773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18099929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361974 + ... + 362023.

Almost surely, 2^18099925 is an apocalyptic number.

It is an amenable number.

18099925 is a deficient number, since it is larger than the sum of its proper divisors (4344013).

18099925 is an equidigital number, since it uses as much as digits as its factorization.

18099925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724007 (or 724002 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 18099925 is about 4254.4006628431. The cubic root of 18099925 is about 262.5582032692.

The spelling of 18099925 in words is "eighteen million, ninety-nine thousand, nine hundred twenty-five".