18057818 has 8 divisors (see below), whose sum is σ = 27105312. Its totient is φ = 9022716.

The previous prime is 18057817. The next prime is 18057839. The reversal of 18057818 is 81875081.

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

It is a super-2 number, since 2×18057818² = 652169581842248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18057817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2771 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (3388164).

Almost surely, 2^18057818 is an apocalyptic number.

18057818 is a deficient number, since it is larger than the sum of its proper divisors (9047494).

18057818 is a wasteful number, since it uses less digits than its factorization.

18057818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 18057818 is about 4249.4491407711. The cubic root of 18057818 is about 262.3544432641.

The spelling of 18057818 in words is "eighteen million, fifty-seven thousand, eight hundred eighteen".