18811025 has 12 divisors (see below), whose sum is σ = 23767452. Its totient is φ = 14763840.

The previous prime is 18811021. The next prime is 18811031. The reversal of 18811025 is 52011881.

It can be written as a sum of positive squares in 6 ways, for example, as 1803649 + 17007376 = 1343^2 + 4124^2 .

It is not a de Polignac number, because 18811025 - 2² = 18811021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18810985 and 18811003.

It is not an unprimeable number, because it can be changed into a prime (18811021) 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, 5774 + ... + 8423.

It is an arithmetic number, because the mean of its divisors is an integer number (1980621).

Almost surely, 2^18811025 is an apocalyptic number.

It is an amenable number.

18811025 is a deficient number, since it is larger than the sum of its proper divisors (4956427).

18811025 is a wasteful number, since it uses less digits than its factorization.

18811025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14260 (or 14255 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18811025 is about 4337.1678547181. The cubic root of 18811025 is about 265.9525467954.

The spelling of 18811025 in words is "eighteen million, eight hundred eleven thousand, twenty-five".