18072894 has 64 divisors (see below), whose sum is σ = 44043264. Its totient is φ = 4832256.

The previous prime is 18072893. The next prime is 18072911. The reversal of 18072894 is 49827081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18072893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51022 + ... + 51374.

It is an arithmetic number, because the mean of its divisors is an integer number (688176).

Almost surely, 2^18072894 is an apocalyptic number.

18072894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18072894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22021632).

18072894 is an abundant number, since it is smaller than the sum of its proper divisors (25970370).

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

18072894 is a wasteful number, since it uses less digits than its factorization.

18072894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18072894 is about 4251.2226476627. Note that the first 3 decimals coincide. The cubic root of 18072894 is about 262.4274339098.

The spelling of 18072894 in words is "eighteen million, seventy-two thousand, eight hundred ninety-four".