18865025 has 12 divisors (see below), whose sum is σ = 23715372. Its totient is φ = 14883840.

The previous prime is 18865009. The next prime is 18865027. The reversal of 18865025 is 52056881.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2808976 + 16056049 = 1676^2 + 4007^2 .

It is not a de Polignac number, because 18865025 - 2⁴ = 18865009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18865027) 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, 3344 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (1976281).

Almost surely, 2^18865025 is an apocalyptic number.

It is an amenable number.

18865025 is a deficient number, since it is larger than the sum of its proper divisors (4850347).

18865025 is a wasteful number, since it uses less digits than its factorization.

18865025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420 (or 10415 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 18865025 is about 4343.3886540350. The cubic root of 18865025 is about 266.2067898461.

The spelling of 18865025 in words is "eighteen million, eight hundred sixty-five thousand, twenty-five".