18940244 has 24 divisors (see below), whose sum is σ = 35598528. Its totient is φ = 8785280.

The previous prime is 18940241. The next prime is 18940249. The reversal of 18940244 is 44204981.

It is a self number, because there is not a number n which added to its sum of digits gives 18940244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2867 + ... + 6789.

It is an arithmetic number, because the mean of its divisors is an integer number (1483272).

Almost surely, 2^18940244 is an apocalyptic number.

It is an amenable number.

18940244 is a deficient number, since it is larger than the sum of its proper divisors (16658284).

18940244 is a wasteful number, since it uses less digits than its factorization.

18940244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015 (or 4013 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 18940244 is about 4352.0390623247. The cubic root of 18940244 is about 266.5601289699.

The spelling of 18940244 in words is "eighteen million, nine hundred forty thousand, two hundred forty-four".