18257441 has 2 divisors, whose sum is σ = 18257442. Its totient is φ = 18257440.

The previous prime is 18257431. The next prime is 18257497. The reversal of 18257441 is 14475281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 279841 = 4240^2 + 529^2 .

It is a cyclic number.

It is not a de Polignac number, because 18257441 - 2¹⁸ = 17995297 is a prime.

It is a super-4 number, since 4×18257441⁴ (a number of 30 digits) contains 4444 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18257398 and 18257407.

It is not a weakly prime, because it can be changed into another prime (18257401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9128720 + 9128721.

It is an arithmetic number, because the mean of its divisors is an integer number (9128721).

Almost surely, 2^18257441 is an apocalyptic number.

It is an amenable number.

18257441 is a deficient number, since it is larger than the sum of its proper divisors (1).

18257441 is an equidigital number, since it uses as much as digits as its factorization.

18257441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 32.

The square root of 18257441 is about 4272.8726870807. The cubic root of 18257441 is about 263.3176488371.

The spelling of 18257441 in words is "eighteen million, two hundred fifty-seven thousand, four hundred forty-one".