18865081 has 8 divisors (see below), whose sum is σ = 20499200. Its totient is φ = 17295120.

The previous prime is 18865031. The next prime is 18865097. The reversal of 18865081 is 18056881.

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 18865081 - 2⁹ = 18864569 is a prime.

It is a super-2 number, since 2×18865081² = 711782562273122, 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 18865081.

It is not an unprimeable number, because it can be changed into a prime (18865031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15426 + ... + 16603.

It is an arithmetic number, because the mean of its divisors is an integer number (2562400).

Almost surely, 2^18865081 is an apocalyptic number.

It is an amenable number.

18865081 is a deficient number, since it is larger than the sum of its proper divisors (1634119).

18865081 is a wasteful number, since it uses less digits than its factorization.

18865081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32079.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 18865081 is about 4343.3951006097. The cubic root of 18865081 is about 266.2070532536.

The spelling of 18865081 in words is "eighteen million, eight hundred sixty-five thousand, eighty-one".