18081425 has 6 divisors (see below), whose sum is σ = 22420998. Its totient is φ = 14465120.

The previous prime is 18081409. The next prime is 18081431. The reversal of 18081425 is 52418081.

It can be written as a sum of positive squares in 3 ways, for example, as 1985281 + 16096144 = 1409^2 + 4012^2 .

It is not a de Polignac number, because 18081425 - 2⁴ = 18081409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 361604 + ... + 361653.

It is an arithmetic number, because the mean of its divisors is an integer number (3736833).

Almost surely, 2^18081425 is an apocalyptic number.

It is an amenable number.

18081425 is a deficient number, since it is larger than the sum of its proper divisors (4339573).

18081425 is an equidigital number, since it uses as much as digits as its factorization.

18081425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723267 (or 723262 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18081425 is about 4252.2258876969. The cubic root of 18081425 is about 262.4687188726.

The spelling of 18081425 in words is "eighteen million, eighty-one thousand, four hundred twenty-five".