18309894 has 32 divisors (see below), whose sum is σ = 38201856. Its totient is φ = 5844960.

The previous prime is 18309887. The next prime is 18309899. The reversal of 18309894 is 49890381.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18309899) 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 15 ways as a sum of consecutive naturals, for example, 14259 + ... + 15489.

It is an arithmetic number, because the mean of its divisors is an integer number (1193808).

Almost surely, 2^18309894 is an apocalyptic number.

18309894 is an abundant number, since it is smaller than the sum of its proper divisors (19891962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18309894 is a wasteful number, since it uses less digits than its factorization.

18309894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18309894 is about 4279.0061930313. The cubic root of 18309894 is about 263.5695752482.

The spelling of 18309894 in words is "eighteen million, three hundred nine thousand, eight hundred ninety-four".