18844493 has 2 divisors, whose sum is σ = 18844494. Its totient is φ = 18844492.

The previous prime is 18844489. The next prime is 18844499. The reversal of 18844493 is 39444881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 4721929 = 3758^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 18844493 - 2² = 18844489 is a prime.

It is a super-2 number, since 2×18844493² = 710229832854098, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18844493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18844499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9422246 + 9422247.

It is an arithmetic number, because the mean of its divisors is an integer number (9422247).

Almost surely, 2^18844493 is an apocalyptic number.

It is an amenable number.

18844493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18844493 is an equidigital number, since it uses as much as digits as its factorization.

18844493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The square root of 18844493 is about 4341.0244182681. The cubic root of 18844493 is about 266.1101782254.

The spelling of 18844493 in words is "eighteen million, eight hundred forty-four thousand, four hundred ninety-three".