18813725 has 12 divisors (see below), whose sum is σ = 26661984. Its totient is φ = 12900720.

The previous prime is 18813689. The next prime is 18813731. The reversal of 18813725 is 52731881.

It is not a de Polignac number, because 18813725 - 2⁸ = 18813469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 53579 + ... + 53928.

It is an arithmetic number, because the mean of its divisors is an integer number (2221832).

Almost surely, 2^18813725 is an apocalyptic number.

It is an amenable number.

18813725 is a deficient number, since it is larger than the sum of its proper divisors (7848259).

18813725 is a wasteful number, since it uses less digits than its factorization.

18813725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107524 (or 107519 counting only the distinct ones).

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

The square root of 18813725 is about 4337.4791065779. The cubic root of 18813725 is about 265.9652704955.

The spelling of 18813725 in words is "eighteen million, eight hundred thirteen thousand, seven hundred twenty-five".