18018910 has 32 divisors (see below), whose sum is σ = 39920832. Its totient is φ = 5702400.

The previous prime is 18018901. The next prime is 18018911. The reversal of 18018910 is 1981081.

It is a super-2 number, since 2×18018910² = 649362235176200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018911) 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 15 ways as a sum of consecutive naturals, for example, 8991 + ... + 10810.

It is an arithmetic number, because the mean of its divisors is an integer number (1247526).

Almost surely, 2^18018910 is an apocalyptic number.

18018910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18018910 is an abundant number, since it is smaller than the sum of its proper divisors (21901922).

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

18018910 is a wasteful number, since it uses less digits than its factorization.

18018910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19828.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 18018910 is about 4244.8686669908. The cubic root of 18018910 is about 262.1658817826.

Adding to 18018910 its reverse (1981081), we get a palindrome (19999991).

The spelling of 18018910 in words is "eighteen million, eighteen thousand, nine hundred ten".