18223645 has 8 divisors (see below), whose sum is σ = 23856480. Its totient is φ = 13253520.

The previous prime is 18223637. The next prime is 18223651. The reversal of 18223645 is 54632281.

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

It is not a de Polignac number, because 18223645 - 2³ = 18223637 is a prime.

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, 165615 + ... + 165724.

It is an arithmetic number, because the mean of its divisors is an integer number (2982060).

Almost surely, 2^18223645 is an apocalyptic number.

It is an amenable number.

18223645 is a deficient number, since it is larger than the sum of its proper divisors (5632835).

18223645 is a wasteful number, since it uses less digits than its factorization.

18223645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331355.

The product of its digits is 11520, while the sum is 31.

The square root of 18223645 is about 4268.9161387875. The cubic root of 18223645 is about 263.1550743943.

It can be divided in two parts, 182236 and 45, that added together give a palindrome (182281).

The spelling of 18223645 in words is "eighteen million, two hundred twenty-three thousand, six hundred forty-five".