18608939 has 4 divisors (see below), whose sum is σ = 18706560. Its totient is φ = 18511320.

The previous prime is 18608917. The next prime is 18608951. The reversal of 18608939 is 93980681.

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 18608939 - 2¹² = 18604843 is a prime.

It is a super-2 number, since 2×18608939² = 692585221411442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18608939.

It is not an unprimeable number, because it can be changed into a prime (18608969) 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, 48524 + ... + 48905.

It is an arithmetic number, because the mean of its divisors is an integer number (4676640).

Almost surely, 2^18608939 is an apocalyptic number.

18608939 is a deficient number, since it is larger than the sum of its proper divisors (97621).

18608939 is an equidigital number, since it uses as much as digits as its factorization.

18608939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97620.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18608939 is about 4313.8079465827. The cubic root of 18608939 is about 264.9967437597.

The spelling of 18608939 in words is "eighteen million, six hundred eight thousand, nine hundred thirty-nine".