18329749 has 2 divisors, whose sum is σ = 18329750. Its totient is φ = 18329748.

The previous prime is 18329743. The next prime is 18329761. The reversal of 18329749 is 94792381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 5499025 = 3582^2 + 2345^2 .

It is an emirp because it is prime and its reverse (94792381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18329749 - 2³ = 18329741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18329741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164874 + 9164875.

It is an arithmetic number, because the mean of its divisors is an integer number (9164875).

Almost surely, 2^18329749 is an apocalyptic number.

It is an amenable number.

18329749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18329749 is an equidigital number, since it uses as much as digits as its factorization.

18329749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 18329749 is about 4281.3256124710. The cubic root of 18329749 is about 263.6648112530.

The spelling of 18329749 in words is "eighteen million, three hundred twenty-nine thousand, seven hundred forty-nine".