18222777 has 12 divisors (see below), whose sum is σ = 26360880. Its totient is φ = 12130488.

The previous prime is 18222769. The next prime is 18222779. The reversal of 18222777 is 77722281.

It is not a de Polignac number, because 18222777 - 2³ = 18222769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18222779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8178 + ... + 10164.

It is an arithmetic number, because the mean of its divisors is an integer number (2196740).

Almost surely, 2^18222777 is an apocalyptic number.

It is an amenable number.

18222777 is a deficient number, since it is larger than the sum of its proper divisors (8138103).

18222777 is a wasteful number, since it uses less digits than its factorization.

18222777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012 (or 3009 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 18222777 is about 4268.8144724267. The cubic root of 18222777 is about 263.1508962651.

It can be divided in two parts, 182 and 22777, that multiplied together give a palindrome (4145414).

The spelling of 18222777 in words is "eighteen million, two hundred twenty-two thousand, seven hundred seventy-seven".