18681079 has 8 divisors (see below), whose sum is σ = 19822320. Its totient is φ = 17544576.

The previous prime is 18681053. The next prime is 18681139. The reversal of 18681079 is 97018681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18681079 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 (18681029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10077 + ... + 11785.

It is an arithmetic number, because the mean of its divisors is an integer number (2477790).

Almost surely, 2^18681079 is an apocalyptic number.

18681079 is a deficient number, since it is larger than the sum of its proper divisors (1141241).

18681079 is a wasteful number, since it uses less digits than its factorization.

18681079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18681079 is about 4322.1613806058. The cubic root of 18681079 is about 265.3387337955.

The spelling of 18681079 in words is "eighteen million, six hundred eighty-one thousand, seventy-nine".