18628369 has 2 divisors, whose sum is σ = 18628370. Its totient is φ = 18628368.

The previous prime is 18628361. The next prime is 18628373. The reversal of 18628369 is 96382681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18378369 + 250000 = 4287^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 18628369 - 2³ = 18628361 is a prime.

It is a super-2 number, since 2×18628369² = 694032263200322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18628361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9314184 + 9314185.

It is an arithmetic number, because the mean of its divisors is an integer number (9314185).

Almost surely, 2^18628369 is an apocalyptic number.

It is an amenable number.

18628369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18628369 is an equidigital number, since it uses as much as digits as its factorization.

18628369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 18628369 is about 4316.0594296186. The cubic root of 18628369 is about 265.0889413096.

The spelling of 18628369 in words is "eighteen million, six hundred twenty-eight thousand, three hundred sixty-nine".