18861825 has 12 divisors (see below), whose sum is σ = 31185008. Its totient is φ = 10059600.

The previous prime is 18861809. The next prime is 18861827. The reversal of 18861825 is 52816881.

It is not a de Polignac number, because 18861825 - 2⁴ = 18861809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18861827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125671 + ... + 125820.

Almost surely, 2^18861825 is an apocalyptic number.

18861825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18861825 is a deficient number, since it is larger than the sum of its proper divisors (12323183).

18861825 is a wasteful number, since it uses less digits than its factorization.

18861825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251504 (or 251499 counting only the distinct ones).

The product of its digits is 30720, while the sum is 39.

The square root of 18861825 is about 4343.0202624441. The cubic root of 18861825 is about 266.1917371247.

The spelling of 18861825 in words is "eighteen million, eight hundred sixty-one thousand, eight hundred twenty-five".