18004394 has 16 divisors (see below), whose sum is σ = 29067336. Its totient is φ = 8332800.

The previous prime is 18004379. The next prime is 18004417. The reversal of 18004394 is 49340081.

It can be written as a sum of positive squares in 4 ways, for example, as 15642025 + 2362369 = 3955^2 + 1537^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2267 + ... + 6414.

Almost surely, 2^18004394 is an apocalyptic number.

18004394 is a deficient number, since it is larger than the sum of its proper divisors (11062942).

18004394 is a wasteful number, since it uses less digits than its factorization.

18004394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8761.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18004394 is about 4243.1584933867. The cubic root of 18004394 is about 262.0954627557.

The spelling of 18004394 in words is "eighteen million, four thousand, three hundred ninety-four".