18425257 has 4 divisors (see below), whose sum is σ = 18527236. Its totient is φ = 18323280.

The previous prime is 18425221. The next prime is 18425261. The reversal of 18425257 is 75252481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 8590761 = 3136^2 + 2931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18425257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18425207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50718 + ... + 51079.

It is an arithmetic number, because the mean of its divisors is an integer number (4631809).

Almost surely, 2^18425257 is an apocalyptic number.

It is an amenable number.

18425257 is a deficient number, since it is larger than the sum of its proper divisors (101979).

18425257 is a wasteful number, since it uses less digits than its factorization.

18425257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101978.

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

The square root of 18425257 is about 4292.4651425492. The cubic root of 18425257 is about 264.1219640391.

The spelling of 18425257 in words is "eighteen million, four hundred twenty-five thousand, two hundred fifty-seven".