18425889 has 12 divisors (see below), whose sum is σ = 27334996. Its totient is φ = 11951712.

The previous prime is 18425879. The next prime is 18425923. The reversal of 18425889 is 98852481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10131489 + 8294400 = 3183^2 + 2880^2 .

It is not a de Polignac number, because 18425889 - 2⁸ = 18425633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18425819) 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, 27334 + ... + 27999.

Almost surely, 2^18425889 is an apocalyptic number.

It is an amenable number.

18425889 is a deficient number, since it is larger than the sum of its proper divisors (8909107).

18425889 is a wasteful number, since it uses less digits than its factorization.

18425889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55376 (or 55373 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 18425889 is about 4292.5387592892. The cubic root of 18425889 is about 264.1249838644.

The spelling of 18425889 in words is "eighteen million, four hundred twenty-five thousand, eight hundred eighty-nine".