18023449 has 2 divisors, whose sum is σ = 18023450. Its totient is φ = 18023448.

The previous prime is 18023441. The next prime is 18023483. The reversal of 18023449 is 94432081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 3583449 = 3800^2 + 1893^2 .

It is a cyclic number.

It is not a de Polignac number, because 18023449 - 2³ = 18023441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18023449.

It is not a weakly prime, because it can be changed into another prime (18023441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9011724 + 9011725.

It is an arithmetic number, because the mean of its divisors is an integer number (9011725).

Almost surely, 2^18023449 is an apocalyptic number.

It is an amenable number.

18023449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18023449 is an equidigital number, since it uses as much as digits as its factorization.

18023449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18023449 is about 4245.4032788417. The cubic root of 18023449 is about 262.1878933070.

The spelling of 18023449 in words is "eighteen million, twenty-three thousand, four hundred forty-nine".