18705625 has 15 divisors (see below), whose sum is σ = 23510443. Its totient is φ = 14878000.

The previous prime is 18705607. The next prime is 18705629. The reversal of 18705625 is 52650781.

The square root of 18705625 is 4325.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 5774409 + 12931216 = 2403^2 + 3596^2 .

It is not a de Polignac number, because 18705625 - 2⁷ = 18705497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18705629) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 108039 + ... + 108211.

Almost surely, 2^18705625 is an apocalyptic number.

18705625 is the 4325-th square number.

18705625 is the 2163-rd centered octagonal number.

It is an amenable number.

18705625 is a deficient number, since it is larger than the sum of its proper divisors (4804818).

18705625 is an frugal number, since it uses more digits than its factorization.

18705625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The cubic root of 18705625 is about 265.4548968582.

The spelling of 18705625 in words is "eighteen million, seven hundred five thousand, six hundred twenty-five".