18345644 has 6 divisors (see below), whose sum is σ = 32104884. Its totient is φ = 9172820.

The previous prime is 18345581. The next prime is 18345653. The reversal of 18345644 is 44654381.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2293202 + ... + 2293209.

It is an arithmetic number, because the mean of its divisors is an integer number (5350814).

Almost surely, 2^18345644 is an apocalyptic number.

It is an amenable number.

18345644 is a deficient number, since it is larger than the sum of its proper divisors (13759240).

18345644 is a wasteful number, since it uses less digits than its factorization.

18345644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586415 (or 4586413 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 18345644 is about 4283.1815277898. The cubic root of 18345644 is about 263.7410032645.

The spelling of 18345644 in words is "eighteen million, three hundred forty-five thousand, six hundred forty-four".