18045778 has 8 divisors (see below), whose sum is σ = 27165168. Its totient is φ = 8990724.

The previous prime is 18045773. The next prime is 18045787. The reversal of 18045778 is 87754081.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18045778.

It is not an unprimeable number, because it can be changed into a prime (18045773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15376 + ... + 16507.

It is an arithmetic number, because the mean of its divisors is an integer number (3395646).

Almost surely, 2^18045778 is an apocalyptic number.

18045778 is a deficient number, since it is larger than the sum of its proper divisors (9119390).

18045778 is a wasteful number, since it uses less digits than its factorization.

18045778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32168.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 18045778 is about 4248.0322503484. The cubic root of 18045778 is about 262.2961222683.

The spelling of 18045778 in words is "eighteen million, forty-five thousand, seven hundred seventy-eight".