18457 has 2 divisors, whose sum is σ = 18458. Its totient is φ = 18456.

The previous prime is 18451. The next prime is 18461. The reversal of 18457 is 75481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17161 + 1296 = 131^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 18457 - 2⁷ = 18329 is a prime.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (18451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9228 + 9229.

It is an arithmetic number, because the mean of its divisors is an integer number (9229).

2¹⁸⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

18457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18457 is an equidigital number, since it uses as much as digits as its factorization.

18457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 18457 is about 135.8565419846. The cubic root of 18457 is about 26.4273553303.

The spelling of 18457 in words is "eighteen thousand, four hundred fifty-seven".