18810749 has 2 divisors, whose sum is σ = 18810750. Its totient is φ = 18810748.

The previous prime is 18810739. The next prime is 18810797. The reversal of 18810749 is 94701881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16345849 + 2464900 = 4043^2 + 1570^2 .

It is an emirp because it is prime and its reverse (94701881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18810749 - 2⁴ = 18810733 is a prime.

It is a Chen prime.

It is equal to p_1199747 and since 18810749 and 1199747 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18810709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405374 + 9405375.

It is an arithmetic number, because the mean of its divisors is an integer number (9405375).

Almost surely, 2^18810749 is an apocalyptic number.

It is an amenable number.

18810749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18810749 is an equidigital number, since it uses as much as digits as its factorization.

18810749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18810749 is about 4337.1360366030. The cubic root of 18810749 is about 265.9512460819.

The spelling of 18810749 in words is "eighteen million, eight hundred ten thousand, seven hundred forty-nine".