18601222 has 4 divisors (see below), whose sum is σ = 27901836. Its totient is φ = 9300610.

The previous prime is 18601211. The next prime is 18601229. The reversal of 18601222 is 22210681.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18601193 and 18601202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18601229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4650304 + ... + 4650307.

It is an arithmetic number, because the mean of its divisors is an integer number (6975459).

Almost surely, 2^18601222 is an apocalyptic number.

18601222 is a deficient number, since it is larger than the sum of its proper divisors (9300614).

18601222 is an equidigital number, since it uses as much as digits as its factorization.

18601222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9300613.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18601222 is about 4312.9134004754. The cubic root of 18601222 is about 264.9601079146.

The spelling of 18601222 in words is "eighteen million, six hundred one thousand, two hundred twenty-two".