18344749 has 2 divisors, whose sum is σ = 18344750. Its totient is φ = 18344748.

The previous prime is 18344741. The next prime is 18344771. The reversal of 18344749 is 94744381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 855625 = 4182^2 + 925^2 .

It is an emirp because it is prime and its reverse (94744381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18344749 - 2³ = 18344741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18344741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9172374 + 9172375.

It is an arithmetic number, because the mean of its divisors is an integer number (9172375).

Almost surely, 2^18344749 is an apocalyptic number.

It is an amenable number.

18344749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18344749 is an equidigital number, since it uses as much as digits as its factorization.

18344749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 18344749 is about 4283.0770481046. The cubic root of 18344749 is about 263.7367142893.

The spelling of 18344749 in words is "eighteen million, three hundred forty-four thousand, seven hundred forty-nine".