18940144 has 10 divisors (see below), whose sum is σ = 36696560. Its totient is φ = 9470064.

The previous prime is 18940127. The next prime is 18940147. The reversal of 18940144 is 44104981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940147) 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 as a sum of consecutive naturals, namely, 591864 + ... + 591895.

It is an arithmetic number, because the mean of its divisors is an integer number (3669656).

Almost surely, 2^18940144 is an apocalyptic number.

It is an amenable number.

18940144 is a deficient number, since it is larger than the sum of its proper divisors (17756416).

18940144 is a wasteful number, since it uses less digits than its factorization.

18940144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183767 (or 1183761 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18940144 is about 4352.0275734421. The cubic root of 18940144 is about 266.5596598443.

The spelling of 18940144 in words is "eighteen million, nine hundred forty thousand, one hundred forty-four".