18315425 has 6 divisors (see below), whose sum is σ = 22711158. Its totient is φ = 14652320.

The previous prime is 18315413. The next prime is 18315461. The reversal of 18315425 is 52451381.

It can be written as a sum of positive squares in 3 ways, for example, as 73984 + 18241441 = 272^2 + 4271^2 .

It is not a de Polignac number, because 18315425 - 2¹⁴ = 18299041 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, 366284 + ... + 366333.

It is an arithmetic number, because the mean of its divisors is an integer number (3785193).

Almost surely, 2^18315425 is an apocalyptic number.

It is an amenable number.

18315425 is a deficient number, since it is larger than the sum of its proper divisors (4395733).

18315425 is an equidigital number, since it uses as much as digits as its factorization.

18315425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732627 (or 732622 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 18315425 is about 4279.6524391590. The cubic root of 18315425 is about 263.5961120222.

The spelling of 18315425 in words is "eighteen million, three hundred fifteen thousand, four hundred twenty-five".