18323644 has 6 divisors (see below), whose sum is σ = 32066384. Its totient is φ = 9161820.

The previous prime is 18323623. The next prime is 18323647. The reversal of 18323644 is 44632381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18323647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2290452 + ... + 2290459.

Almost surely, 2^18323644 is an apocalyptic number.

It is an amenable number.

18323644 is a deficient number, since it is larger than the sum of its proper divisors (13742740).

18323644 is a wasteful number, since it uses less digits than its factorization.

18323644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4580915 (or 4580913 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 18323644 is about 4280.6125729853. The cubic root of 18323644 is about 263.6355354855.

It can be divided in two parts, 1832 and 3644, that added together give a square (5476 = 74²).

The spelling of 18323644 in words is "eighteen million, three hundred twenty-three thousand, six hundred forty-four".