18381425 has 12 divisors (see below), whose sum is σ = 23324400. Its totient is φ = 14362320.

The previous prime is 18381397. The next prime is 18381457. The reversal of 18381425 is 52418381.

It is not a de Polignac number, because 18381425 - 2⁶ = 18381361 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18381391 and 18381400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7475 + ... + 9624.

It is an arithmetic number, because the mean of its divisors is an integer number (1943700).

Almost surely, 2^18381425 is an apocalyptic number.

It is an amenable number.

18381425 is a deficient number, since it is larger than the sum of its proper divisors (4942975).

18381425 is a wasteful number, since it uses less digits than its factorization.

18381425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17152 (or 17147 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 18381425 is about 4287.3564115898. The cubic root of 18381425 is about 263.9123570798.

The spelling of 18381425 in words is "eighteen million, three hundred eighty-one thousand, four hundred twenty-five".