18416881 has 8 divisors (see below), whose sum is σ = 21178304. Its totient is φ = 15688080.

The previous prime is 18416873. The next prime is 18416887. The reversal of 18416881 is 18861481.

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 18416881 - 2³ = 18416873 is a prime.

It is a super-2 number, since 2×18416881² = 678363011536322, 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 18416881.

It is not an unprimeable number, because it can be changed into a prime (18416887) 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, 6930 + ... + 9211.

It is an arithmetic number, because the mean of its divisors is an integer number (2647288).

Almost surely, 2^18416881 is an apocalyptic number.

It is an amenable number.

18416881 is a deficient number, since it is larger than the sum of its proper divisors (2761423).

18416881 is a wasteful number, since it uses less digits than its factorization.

18416881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16311.

The product of its digits is 12288, while the sum is 37.

The square root of 18416881 is about 4291.4893685060. The cubic root of 18416881 is about 264.0819352734.

The spelling of 18416881 in words is "eighteen million, four hundred sixteen thousand, eight hundred eighty-one".