18736749 has 6 divisors (see below), whose sum is σ = 27064206. Its totient is φ = 12491160.

The previous prime is 18736733. The next prime is 18736759. The reversal of 18736749 is 94763781.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 4334724 = 3795^2 + 2082^2 .

It is not a de Polignac number, because 18736749 - 2⁴ = 18736733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18736709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1040922 + ... + 1040939.

It is an arithmetic number, because the mean of its divisors is an integer number (4510701).

Almost surely, 2^18736749 is an apocalyptic number.

It is an amenable number.

18736749 is a deficient number, since it is larger than the sum of its proper divisors (8327457).

18736749 is a wasteful number, since it uses less digits than its factorization.

18736749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081867 (or 2081864 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 18736749 is about 4328.5966548063. The cubic root of 18736749 is about 265.6020440415.

The spelling of 18736749 in words is "eighteen million, seven hundred thirty-six thousand, seven hundred forty-nine".