18844417 has 2 divisors, whose sum is σ = 18844418. Its totient is φ = 18844416.

The previous prime is 18844411. The next prime is 18844457. The reversal of 18844417 is 71444881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11451456 + 7392961 = 3384^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844417 - 2⁷ = 18844289 is a prime.

It is a super-2 number, since 2×18844417² = 710224104139778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18844411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422208 + 9422209.

It is an arithmetic number, because the mean of its divisors is an integer number (9422209).

Almost surely, 2^18844417 is an apocalyptic number.

It is an amenable number.

18844417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844417 is an equidigital number, since it uses as much as digits as its factorization.

18844417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 37.

The square root of 18844417 is about 4341.0156645651. The cubic root of 18844417 is about 266.1098204834.

The spelling of 18844417 in words is "eighteen million, eight hundred forty-four thousand, four hundred seventeen".