18000457 has 2 divisors, whose sum is σ = 18000458. Its totient is φ = 18000456.

The previous prime is 18000439. The next prime is 18000469. The reversal of 18000457 is 75400081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 6056521 = 3456^2 + 2461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18000457 is a prime.

It is not a weakly prime, because it can be changed into another prime (18000407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000228 + 9000229.

It is an arithmetic number, because the mean of its divisors is an integer number (9000229).

Almost surely, 2^18000457 is an apocalyptic number.

It is an amenable number.

18000457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000457 is an equidigital number, since it uses as much as digits as its factorization.

18000457 is an evil number, because the sum of its binary digits is even.

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

The square root of 18000457 is about 4242.6945447439. The cubic root of 18000457 is about 262.0763573259.

The spelling of 18000457 in words is "eighteen million, four hundred fifty-seven", and thus it is an aban number.