18040578 has 8 divisors (see below), whose sum is σ = 36081168. Its totient is φ = 6013524.

The previous prime is 18040559. The next prime is 18040591. The reversal of 18040578 is 87504081.

It is a happy number.

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

18040578 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503376 + ... + 1503387.

It is an arithmetic number, because the mean of its divisors is an integer number (4510146).

Almost surely, 2^18040578 is an apocalyptic number.

18040578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18040578 is a wasteful number, since it uses less digits than its factorization.

18040578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006768.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18040578 is about 4247.4201581666. The cubic root of 18040578 is about 262.2709257770.

The spelling of 18040578 in words is "eighteen million, forty thousand, five hundred seventy-eight".