18734749 has 4 divisors (see below), whose sum is σ = 20437920. Its totient is φ = 17031580.

The previous prime is 18734743. The next prime is 18734759. The reversal of 18734749 is 94743781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18734749 - 2⁹ = 18734237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18734743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851569 + ... + 851590.

It is an arithmetic number, because the mean of its divisors is an integer number (5109480).

Almost surely, 2^18734749 is an apocalyptic number.

It is an amenable number.

18734749 is a deficient number, since it is larger than the sum of its proper divisors (1703171).

18734749 is a wasteful number, since it uses less digits than its factorization.

18734749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703170.

The product of its digits is 169344, while the sum is 43.

The square root of 18734749 is about 4328.3656268850. The cubic root of 18734749 is about 265.5925933983.

The spelling of 18734749 in words is "eighteen million, seven hundred thirty-four thousand, seven hundred forty-nine".