18444731 has 2 divisors, whose sum is σ = 18444732. Its totient is φ = 18444730.

The previous prime is 18444707. The next prime is 18444733. The reversal of 18444731 is 13744481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18444731 - 2¹⁸ = 18182587 is a prime.

It is a super-2 number, since 2×18444731² = 680416203324722, which contains 22 as substring.

Together with 18444733, 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 (18444733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9222365 + 9222366.

It is an arithmetic number, because the mean of its divisors is an integer number (9222366).

Almost surely, 2^18444731 is an apocalyptic number.

18444731 is a deficient number, since it is larger than the sum of its proper divisors (1).

18444731 is an equidigital number, since it uses as much as digits as its factorization.

18444731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 32.

The square root of 18444731 is about 4294.7329369822. The cubic root of 18444731 is about 264.2149830962.

The spelling of 18444731 in words is "eighteen million, four hundred forty-four thousand, seven hundred thirty-one".