18679881 has 8 divisors (see below), whose sum is σ = 27170784. Its totient is φ = 11321120.

The previous prime is 18679873. The next prime is 18679883. The reversal of 18679881 is 18897681.

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

It is a cyclic number.

It is not a de Polignac number, because 18679881 - 2³ = 18679873 is a prime.

It is a super-2 number, since 2×18679881² = 697875908348322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18679881.

It is not an unprimeable number, because it can be changed into a prime (18679883) 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, 282996 + ... + 283061.

It is an arithmetic number, because the mean of its divisors is an integer number (3396348).

Almost surely, 2^18679881 is an apocalyptic number.

18679881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18679881 is a deficient number, since it is larger than the sum of its proper divisors (8490903).

18679881 is a wasteful number, since it uses less digits than its factorization.

18679881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566071.

The product of its digits is 193536, while the sum is 48.

The square root of 18679881 is about 4322.0227903147. The cubic root of 18679881 is about 265.3330616999. Note that the first 3 decimals are identical.

The spelling of 18679881 in words is "eighteen million, six hundred seventy-nine thousand, eight hundred eighty-one".