18366457 has 2 divisors, whose sum is σ = 18366458. Its totient is φ = 18366456.

The previous prime is 18366449. The next prime is 18366479. The reversal of 18366457 is 75466381.

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., 16679056 + 1687401 = 4084^2 + 1299^2 .

It is a cyclic number.

It is not a de Polignac number, because 18366457 - 2³ = 18366449 is a prime.

It is not a weakly prime, because it can be changed into another prime (18366427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183228 + 9183229.

It is an arithmetic number, because the mean of its divisors is an integer number (9183229).

Almost surely, 2^18366457 is an apocalyptic number.

It is an amenable number.

18366457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366457 is an equidigital number, since it uses as much as digits as its factorization.

18366457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 18366457 is about 4285.6104582661. The cubic root of 18366457 is about 263.8407029893.

The spelling of 18366457 in words is "eighteen million, three hundred sixty-six thousand, four hundred fifty-seven".