18289946 has 8 divisors (see below), whose sum is σ = 27463104. Its totient is φ = 9135580.

The previous prime is 18289937. The next prime is 18289961. The reversal of 18289946 is 64998281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18289946.

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 in 3 ways as a sum of consecutive naturals, for example, 1940 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (3432888).

Almost surely, 2^18289946 is an apocalyptic number.

18289946 is a deficient number, since it is larger than the sum of its proper divisors (9173158).

18289946 is a wasteful number, since it uses less digits than its factorization.

18289946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9396.

The product of its digits is 248832, while the sum is 47.

The square root of 18289946 is about 4276.6746427569. The cubic root of 18289946 is about 263.4738238036.

The spelling of 18289946 in words is "eighteen million, two hundred eighty-nine thousand, nine hundred forty-six".