18252644 has 12 divisors (see below), whose sum is σ = 31972668. Its totient is φ = 9117600.

The previous prime is 18252643. The next prime is 18252659. The reversal of 18252644 is 44625281.

It can be written as a sum of positive squares in 2 ways, for example, as 5579044 + 12673600 = 2362^2 + 3560^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18252644.

It is not an unprimeable number, because it can be changed into a prime (18252643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5654 + ... + 8274.

It is an arithmetic number, because the mean of its divisors is an integer number (2664389).

Almost surely, 2^18252644 is an apocalyptic number.

It is an amenable number.

18252644 is a deficient number, since it is larger than the sum of its proper divisors (13720024).

18252644 is a wasteful number, since it uses less digits than its factorization.

18252644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366 (or 4364 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 18252644 is about 4272.3113182445. The cubic root of 18252644 is about 263.2945852653.

The spelling of 18252644 in words is "eighteen million, two hundred fifty-two thousand, six hundred forty-four".