18862221 has 16 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 10746048.

The previous prime is 18862213. The next prime is 18862247. The reversal of 18862221 is 12226881.

It is not a de Polignac number, because 18862221 - 2³ = 18862213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18862211) 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, 7015 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (1801800).

Almost surely, 2^18862221 is an apocalyptic number.

It is an amenable number.

18862221 is a deficient number, since it is larger than the sum of its proper divisors (9966579).

18862221 is a wasteful number, since it uses less digits than its factorization.

18862221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708.

The product of its digits is 3072, while the sum is 30.

The square root of 18862221 is about 4343.0658525977. The cubic root of 18862221 is about 266.1935999912.

The spelling of 18862221 in words is "eighteen million, eight hundred sixty-two thousand, two hundred twenty-one".