18280394 has 32 divisors (see below), whose sum is σ = 31872960. Its totient is φ = 7776000.

The previous prime is 18280369. The next prime is 18280397. The reversal of 18280394 is 49308281.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18280397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42002 + ... + 42434.

It is an arithmetic number, because the mean of its divisors is an integer number (996030).

Almost surely, 2^18280394 is an apocalyptic number.

18280394 is a deficient number, since it is larger than the sum of its proper divisors (13592566).

18280394 is a wasteful number, since it uses less digits than its factorization.

18280394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18280394 is about 4275.5577413947. The cubic root of 18280394 is about 263.4279490516.

The spelling of 18280394 in words is "eighteen million, two hundred eighty thousand, three hundred ninety-four".