18493369 has 2 divisors, whose sum is σ = 18493370. Its totient is φ = 18493368.

The previous prime is 18493339. The next prime is 18493379. The reversal of 18493369 is 96339481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 473344 = 4245^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 18493369 - 2¹⁷ = 18362297 is a prime.

It is a super-2 number, since 2×18493369² = 684009393940322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18493339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9246684 + 9246685.

It is an arithmetic number, because the mean of its divisors is an integer number (9246685).

Almost surely, 2^18493369 is an apocalyptic number.

It is an amenable number.

18493369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18493369 is an equidigital number, since it uses as much as digits as its factorization.

18493369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 18493369 is about 4300.3917263431. The cubic root of 18493369 is about 264.4470206198.

The spelling of 18493369 in words is "eighteen million, four hundred ninety-three thousand, three hundred sixty-nine".