18634739 has 4 divisors (see below), whose sum is σ = 18652824. Its totient is φ = 18616656.

The previous prime is 18634709. The next prime is 18634741. The reversal of 18634739 is 93743681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18634739 - 2¹⁶ = 18569203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18634696 and 18634705.

It is not an unprimeable number, because it can be changed into a prime (18634709) 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, 7397 + ... + 9590.

It is an arithmetic number, because the mean of its divisors is an integer number (4663206).

Almost surely, 2^18634739 is an apocalyptic number.

18634739 is a deficient number, since it is larger than the sum of its proper divisors (18085).

18634739 is a wasteful number, since it uses less digits than its factorization.

18634739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18084.

The product of its digits is 108864, while the sum is 41.

The square root of 18634739 is about 4316.7973081904. The cubic root of 18634739 is about 265.1191537259.

The spelling of 18634739 in words is "eighteen million, six hundred thirty-four thousand, seven hundred thirty-nine".