18636081 has 8 divisors (see below), whose sum is σ = 24868704. Its totient is φ = 12413760.

The previous prime is 18636077. The next prime is 18636091. The reversal of 18636081 is 18063681.

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

It is not a de Polignac number, because 18636081 - 2² = 18636077 is a prime.

It is a super-2 number, since 2×18636081² = 694607030077122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18636001) 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, 4185 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (3108588).

Almost surely, 2^18636081 is an apocalyptic number.

It is an amenable number.

18636081 is a deficient number, since it is larger than the sum of its proper divisors (6232623).

18636081 is a wasteful number, since it uses less digits than its factorization.

18636081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18636081 is about 4316.9527447031. The cubic root of 18636081 is about 265.1255178498.

The spelling of 18636081 in words is "eighteen million, six hundred thirty-six thousand, eighty-one".