18436645 has 8 divisors (see below), whose sum is σ = 22150656. Its totient is φ = 14731536.

The previous prime is 18436609. The next prime is 18436651. The reversal of 18436645 is 54663481.

It is a happy number.

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 18436645 - 2²¹ = 16339493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3844 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (2768832).

Almost surely, 2^18436645 is an apocalyptic number.

It is an amenable number.

18436645 is a deficient number, since it is larger than the sum of its proper divisors (3714011).

18436645 is a wasteful number, since it uses less digits than its factorization.

18436645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451.

The product of its digits is 69120, while the sum is 37.

The square root of 18436645 is about 4293.7914481260. The cubic root of 18436645 is about 264.1763676486.

The spelling of 18436645 in words is "eighteen million, four hundred thirty-six thousand, six hundred forty-five".