18556725 has 48 divisors (see below), whose sum is σ = 33997824. Its totient is φ = 8856000.

The previous prime is 18556709. The next prime is 18556729. The reversal of 18556725 is 52765581.

It is not a de Polignac number, because 18556725 - 2⁴ = 18556709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18556729) 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 47 ways as a sum of consecutive naturals, for example, 68340 + ... + 68610.

It is an arithmetic number, because the mean of its divisors is an integer number (708288).

Almost surely, 2^18556725 is an apocalyptic number.

18556725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18556725 is a deficient number, since it is larger than the sum of its proper divisors (15441099).

18556725 is a wasteful number, since it uses less digits than its factorization.

18556725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 373 counting only the distinct ones).

The product of its digits is 84000, while the sum is 39.

The square root of 18556725 is about 4307.7517337934. The cubic root of 18556725 is about 264.7486640366.

Subtracting 18556725 from its reverse (52765581), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 18556725 in words is "eighteen million, five hundred fifty-six thousand, seven hundred twenty-five".