18944919 has 72 divisors (see below), whose sum is σ = 35661600. Its totient is φ = 9652608.

The previous prime is 18944909. The next prime is 18944927. The reversal of 18944919 is 91944981.

It is not a de Polignac number, because 18944919 - 2⁷ = 18944791 is a prime.

It is a super-2 number, since 2×18944919² = 717819911833122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944909) 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 in 71 ways as a sum of consecutive naturals, for example, 997092 + ... + 997110.

It is an arithmetic number, because the mean of its divisors is an integer number (495300).

Almost surely, 2^18944919 is an apocalyptic number.

18944919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18944919 is a deficient number, since it is larger than the sum of its proper divisors (16716681).

18944919 is a wasteful number, since it uses less digits than its factorization.

18944919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 46 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18944919 is about 4352.5761337397. The cubic root of 18944919 is about 266.5820587487.

The spelling of 18944919 in words is "eighteen million, nine hundred forty-four thousand, nine hundred nineteen".