18736745 has 4 divisors (see below), whose sum is σ = 22484100. Its totient is φ = 14989392.

The previous prime is 18736733. The next prime is 18736759. The reversal of 18736745 is 54763781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54763781 = 977 ⋅56053.

It can be written as a sum of positive squares in 2 ways, for example, as 8826841 + 9909904 = 2971^2 + 3148^2 .

It is a cyclic number.

It is not a de Polignac number, because 18736745 - 2⁶ = 18736681 is a prime.

It is a super-2 number, since 2×18736745² = 702131226390050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1873670 + ... + 1873679.

It is an arithmetic number, because the mean of its divisors is an integer number (5621025).

Almost surely, 2^18736745 is an apocalyptic number.

It is an amenable number.

18736745 is a deficient number, since it is larger than the sum of its proper divisors (3747355).

18736745 is an equidigital number, since it uses as much as digits as its factorization.

18736745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747354.

The product of its digits is 141120, while the sum is 41.

The square root of 18736745 is about 4328.5961927627. The cubic root of 18736745 is about 265.6020251409.

The spelling of 18736745 in words is "eighteen million, seven hundred thirty-six thousand, seven hundred forty-five".