18944365 has 24 divisors (see below), whose sum is σ = 25271064. Its totient is φ = 13622400.

The previous prime is 18944363. The next prime is 18944377. The reversal of 18944365 is 56344981.

18944365 = 23² + 24² + ... + 384².

It can be written as a sum of positive squares in 4 ways, for example, as 915849 + 18028516 = 957^2 + 4246^2 .

It is not a de Polignac number, because 18944365 - 2¹ = 18944363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104575 + ... + 104755.

It is an arithmetic number, because the mean of its divisors is an integer number (1052961).

Almost surely, 2^18944365 is an apocalyptic number.

It is an amenable number.

18944365 is a deficient number, since it is larger than the sum of its proper divisors (6326699).

18944365 is a wasteful number, since it uses less digits than its factorization.

18944365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 370 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 18944365 is about 4352.5124928023. The cubic root of 18944365 is about 266.5794601998.

The spelling of 18944365 in words is "eighteen million, nine hundred forty-four thousand, three hundred sixty-five".