18919244 has 6 divisors (see below), whose sum is σ = 33108684. Its totient is φ = 9459620.

The previous prime is 18919237. The next prime is 18919267. The reversal of 18919244 is 44291981.

It is a junction number, because it is equal to n+sod(n) for n = 18919198 and 18919207.

It is an unprimeable number.

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, 2364902 + ... + 2364909.

It is an arithmetic number, because the mean of its divisors is an integer number (5518114).

Almost surely, 2^18919244 is an apocalyptic number.

It is an amenable number.

18919244 is a deficient number, since it is larger than the sum of its proper divisors (14189440).

18919244 is a wasteful number, since it uses less digits than its factorization.

18919244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729815 (or 4729813 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 18919244 is about 4349.6257310256. The cubic root of 18919244 is about 266.4615763355.

The spelling of 18919244 in words is "eighteen million, nine hundred nineteen thousand, two hundred forty-four".