18072944 has 10 divisors (see below), whose sum is σ = 35016360. Its totient is φ = 9036464.

The previous prime is 18072913. The next prime is 18072949. The reversal of 18072944 is 44927081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18072949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564764 + ... + 564795.

It is an arithmetic number, because the mean of its divisors is an integer number (3501636).

Almost surely, 2^18072944 is an apocalyptic number.

It is an amenable number.

18072944 is a deficient number, since it is larger than the sum of its proper divisors (16943416).

18072944 is a wasteful number, since it uses less digits than its factorization.

18072944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129567 (or 1129561 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18072944 is about 4251.2285283198. The cubic root of 18072944 is about 262.4276759179.

The spelling of 18072944 in words is "eighteen million, seventy-two thousand, nine hundred forty-four".