18366437 has 2 divisors, whose sum is σ = 18366438. Its totient is φ = 18366436.

The previous prime is 18366431. The next prime is 18366449. The reversal of 18366437 is 73466381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 1069156 = 4159^2 + 1034^2 .

It is an emirp because it is prime and its reverse (73466381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18366437 - 2⁴ = 18366421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18366437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18366431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183218 + 9183219.

It is an arithmetic number, because the mean of its divisors is an integer number (9183219).

Almost surely, 2^18366437 is an apocalyptic number.

It is an amenable number.

18366437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366437 is an equidigital number, since it uses as much as digits as its factorization.

18366437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 18366437 is about 4285.6081248756. The cubic root of 18366437 is about 263.8406072202.

The spelling of 18366437 in words is "eighteen million, three hundred sixty-six thousand, four hundred thirty-seven".