18842413 has 2 divisors, whose sum is σ = 18842414. Its totient is φ = 18842412.

The previous prime is 18842407. The next prime is 18842437. The reversal of 18842413 is 31424881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12299049 + 6543364 = 3507^2 + 2558^2 .

It is an emirp because it is prime and its reverse (31424881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18842413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18843413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421206 + 9421207.

It is an arithmetic number, because the mean of its divisors is an integer number (9421207).

Almost surely, 2^18842413 is an apocalyptic number.

It is an amenable number.

18842413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18842413 is an equidigital number, since it uses as much as digits as its factorization.

18842413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 31.

The square root of 18842413 is about 4340.7848368699. The cubic root of 18842413 is about 266.1003870442.

The spelling of 18842413 in words is "eighteen million, eight hundred forty-two thousand, four hundred thirteen".