18257425 has 6 divisors (see below), whose sum is σ = 22639238. Its totient is φ = 14605920.

The previous prime is 18257401. The next prime is 18257429. The reversal of 18257425 is 52475281.

It is a happy number.

18257425 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 3 ways, for example, as 2193361 + 16064064 = 1481^2 + 4008^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18257425 is a prime.

It is a super-4 number, since 4×18257425⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18257429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 365124 + ... + 365173.

Almost surely, 2^18257425 is an apocalyptic number.

It is an amenable number.

18257425 is a deficient number, since it is larger than the sum of its proper divisors (4381813).

18257425 is an equidigital number, since it uses as much as digits as its factorization.

18257425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730307 (or 730302 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

The square root of 18257425 is about 4272.8708148036. The cubic root of 18257425 is about 263.3175719171.

The spelling of 18257425 in words is "eighteen million, two hundred fifty-seven thousand, four hundred twenty-five".