18398025 has 18 divisors (see below), whose sum is σ = 32953310. Its totient is φ = 9812160.

The previous prime is 18398021. The next prime is 18398069. The reversal of 18398025 is 52089381.

It can be written as a sum of positive squares in 3 ways, for example, as 45369 + 18352656 = 213^2 + 4284^2 .

It is not a de Polignac number, because 18398025 - 2² = 18398021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18398021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40660 + ... + 41109.

Almost surely, 2^18398025 is an apocalyptic number.

18398025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18398025 is a deficient number, since it is larger than the sum of its proper divisors (14555285).

18398025 is a wasteful number, since it uses less digits than its factorization.

18398025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81785 (or 81777 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18398025 is about 4289.2918996030. The cubic root of 18398025 is about 263.9917783252.

The spelling of 18398025 in words is "eighteen million, three hundred ninety-eight thousand, twenty-five".