18396449 has 2 divisors, whose sum is σ = 18396450. Its totient is φ = 18396448.

The previous prime is 18396439. The next prime is 18396463. The reversal of 18396449 is 94469381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 180625 = 4268^2 + 425^2 .

It is an emirp because it is prime and its reverse (94469381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18396449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18396409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9198224 + 9198225.

It is an arithmetic number, because the mean of its divisors is an integer number (9198225).

Almost surely, 2^18396449 is an apocalyptic number.

It is an amenable number.

18396449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18396449 is an equidigital number, since it uses as much as digits as its factorization.

18396449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 18396449 is about 4289.1081823615. The cubic root of 18396449 is about 263.9842401443.

The spelling of 18396449 in words is "eighteen million, three hundred ninety-six thousand, four hundred forty-nine".