18211008 has 28 divisors (see below), whose sum is σ = 48183800. Its totient is φ = 6070272.

The previous prime is 18210989. The next prime is 18211013. The reversal of 18211008 is 80011281.

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, 47233 + ... + 47616.

It is an arithmetic number, because the mean of its divisors is an integer number (1720850).

Almost surely, 2^18211008 is an apocalyptic number.

It is an amenable number.

18211008 is an abundant number, since it is smaller than the sum of its proper divisors (29972792).

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

18211008 is an equidigital number, since it uses as much as digits as its factorization.

18211008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94864 (or 94854 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 18211008 is about 4267.4357640157. The cubic root of 18211008 is about 263.0942329317.

Adding to 18211008 its reverse (80011281), we get a palindrome (98222289).

The spelling of 18211008 in words is "eighteen million, two hundred eleven thousand, eight".