18413849 has 2 divisors, whose sum is σ = 18413850. Its totient is φ = 18413848.

The previous prime is 18413821. The next prime is 18413851. The reversal of 18413849 is 94831481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 198025 = 4268^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18413849 is a prime.

Together with 18413851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18413809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9206924 + 9206925.

It is an arithmetic number, because the mean of its divisors is an integer number (9206925).

Almost surely, 2^18413849 is an apocalyptic number.

It is an amenable number.

18413849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18413849 is an equidigital number, since it uses as much as digits as its factorization.

18413849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 18413849 is about 4291.1360966532. The cubic root of 18413849 is about 264.0674424037.

The spelling of 18413849 in words is "eighteen million, four hundred thirteen thousand, eight hundred forty-nine".