18728025 has 24 divisors (see below), whose sum is σ = 31408704. Its totient is φ = 9844800.

The previous prime is 18728023. The next prime is 18728051. The reversal of 18728025 is 52082781.

It is not a de Polignac number, because 18728025 - 2¹ = 18728023 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18728023) 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, 3567 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (1308696).

Almost surely, 2^18728025 is an apocalyptic number.

18728025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18728025 is a deficient number, since it is larger than the sum of its proper divisors (12680679).

18728025 is a wasteful number, since it uses less digits than its factorization.

18728025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601 (or 3596 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18728025 is about 4327.5888205790. The cubic root of 18728025 is about 265.5608154031.

The spelling of 18728025 in words is "eighteen million, seven hundred twenty-eight thousand, twenty-five".