18398725 has 6 divisors (see below), whose sum is σ = 22814450. Its totient is φ = 14718960.

The previous prime is 18398719. The next prime is 18398729. The reversal of 18398725 is 52789381.

It can be written as a sum of positive squares in 3 ways, for example, as 276676 + 18122049 = 526^2 + 4257^2 .

It is not a de Polignac number, because 18398725 - 2¹⁷ = 18267653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 367950 + ... + 367999.

Almost surely, 2^18398725 is an apocalyptic number.

It is an amenable number.

18398725 is a deficient number, since it is larger than the sum of its proper divisors (4415725).

18398725 is an equidigital number, since it uses as much as digits as its factorization.

18398725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735959 (or 735954 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 18398725 is about 4289.3734973770. The cubic root of 18398725 is about 263.9951263640.

The spelling of 18398725 in words is "eighteen million, three hundred ninety-eight thousand, seven hundred twenty-five".