18137825 has 12 divisors (see below), whose sum is σ = 22633968. Its totient is φ = 14418000.

The previous prime is 18137809. The next prime is 18137849. The reversal of 18137825 is 52873181.

It is not a de Polignac number, because 18137825 - 2⁴ = 18137809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1850 + ... + 6300.

It is an arithmetic number, because the mean of its divisors is an integer number (1886164).

Almost surely, 2^18137825 is an apocalyptic number.

It is an amenable number.

18137825 is a deficient number, since it is larger than the sum of its proper divisors (4496143).

18137825 is a wasteful number, since it uses less digits than its factorization.

18137825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624 (or 4619 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 18137825 is about 4258.8525449938. The cubic root of 18137825 is about 262.7413351225.

The spelling of 18137825 in words is "eighteen million, one hundred thirty-seven thousand, eight hundred twenty-five".