18344773 has 2 divisors, whose sum is σ = 18344774. Its totient is φ = 18344772.

The previous prime is 18344771. The next prime is 18344813. The reversal of 18344773 is 37744381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 4334724 = 3743^2 + 2082^2 .

It is a cyclic number.

It is not a de Polignac number, because 18344773 - 2¹ = 18344771 is a prime.

Together with 18344771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18344771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9172386 + 9172387.

It is an arithmetic number, because the mean of its divisors is an integer number (9172387).

Almost surely, 2^18344773 is an apocalyptic number.

It is an amenable number.

18344773 is a deficient number, since it is larger than the sum of its proper divisors (1).

18344773 is an equidigital number, since it uses as much as digits as its factorization.

18344773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 37.

The square root of 18344773 is about 4283.0798498277. The cubic root of 18344773 is about 263.7368293027.

The spelling of 18344773 in words is "eighteen million, three hundred forty-four thousand, seven hundred seventy-three".