18145918 has 8 divisors (see below), whose sum is σ = 31107312. Its totient is φ = 7776816.

The previous prime is 18145913. The next prime is 18145921. The reversal of 18145918 is 81954181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18145913) 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 3 ways as a sum of consecutive naturals, for example, 648055 + ... + 648082.

It is an arithmetic number, because the mean of its divisors is an integer number (3888414).

Almost surely, 2^18145918 is an apocalyptic number.

18145918 is a deficient number, since it is larger than the sum of its proper divisors (12961394).

18145918 is a wasteful number, since it uses less digits than its factorization.

18145918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296146.

The product of its digits is 11520, while the sum is 37.

The square root of 18145918 is about 4259.8025775850. The cubic root of 18145918 is about 262.7804072356.

The spelling of 18145918 in words is "eighteen million, one hundred forty-five thousand, nine hundred eighteen".