18521025 has 12 divisors (see below), whose sum is σ = 30621552. Its totient is φ = 9877840.

The previous prime is 18521023. The next prime is 18521047. The reversal of 18521025 is 52012581.

It is not a de Polignac number, because 18521025 - 2¹ = 18521023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18520986 and 18521004.

It is not an unprimeable number, because it can be changed into a prime (18521021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123399 + ... + 123548.

It is an arithmetic number, because the mean of its divisors is an integer number (2551796).

Almost surely, 2^18521025 is an apocalyptic number.

18521025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18521025 is a deficient number, since it is larger than the sum of its proper divisors (12100527).

18521025 is a wasteful number, since it uses less digits than its factorization.

18521025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246960 (or 246955 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 18521025 is about 4303.6060460967. The cubic root of 18521025 is about 264.5787778302.

The spelling of 18521025 in words is "eighteen million, five hundred twenty-one thousand, twenty-five".