18944290 has 32 divisors (see below), whose sum is σ = 36889344. Its totient is φ = 6977280.

The previous prime is 18944269. The next prime is 18944293. The reversal of 18944290 is 9244981.

It is a happy number.

It is a super-2 number, since 2×18944290² = 717772247208200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18944293) 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 15 ways as a sum of consecutive naturals, for example, 6805 + ... + 9175.

It is an arithmetic number, because the mean of its divisors is an integer number (1152792).

Almost surely, 2^18944290 is an apocalyptic number.

18944290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18944290 is a deficient number, since it is larger than the sum of its proper divisors (17945054).

18944290 is a wasteful number, since it uses less digits than its factorization.

18944290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18944290 is about 4352.5038770804. The cubic root of 18944290 is about 266.5791084067.

The spelling of 18944290 in words is "eighteen million, nine hundred forty-four thousand, two hundred ninety".