18212811 has 24 divisors (see below), whose sum is σ = 26115264. Its totient is φ = 11286000.

The previous prime is 18212807. The next prime is 18212827. The reversal of 18212811 is 11821281.

It is not a de Polignac number, because 18212811 - 2² = 18212807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18212861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72436 + ... + 72686.

It is an arithmetic number, because the mean of its divisors is an integer number (1088136).

Almost surely, 2^18212811 is an apocalyptic number.

18212811 is a deficient number, since it is larger than the sum of its proper divisors (7902453).

18212811 is a wasteful number, since it uses less digits than its factorization.

18212811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 340 counting only the distinct ones).

The product of its digits is 256, while the sum is 24.

The square root of 18212811 is about 4267.6470097701. The cubic root of 18212811 is about 263.1029152856.

The spelling of 18212811 in words is "eighteen million, two hundred twelve thousand, eight hundred eleven".