18223664 has 10 divisors (see below), whose sum is σ = 35308380. Its totient is φ = 9111824.

The previous prime is 18223663. The next prime is 18223703. The reversal of 18223664 is 46632281.

It is a self number, because there is not a number n which added to its sum of digits gives 18223664.

It is not an unprimeable number, because it can be changed into a prime (18223663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569474 + ... + 569505.

It is an arithmetic number, because the mean of its divisors is an integer number (3530838).

Almost surely, 2^18223664 is an apocalyptic number.

It is an amenable number.

18223664 is a deficient number, since it is larger than the sum of its proper divisors (17084716).

18223664 is a wasteful number, since it uses less digits than its factorization.

18223664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138987 (or 1138981 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 18223664 is about 4268.9183641761. The cubic root of 18223664 is about 263.1551658496.

The spelling of 18223664 in words is "eighteen million, two hundred twenty-three thousand, six hundred sixty-four".