18222836 has 6 divisors (see below), whose sum is σ = 31889970. Its totient is φ = 9111416.

The previous prime is 18222829. The next prime is 18222859. The reversal of 18222836 is 63822281.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 3400336 = 3850^2 + 1844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277851 + ... + 2277858.

It is an arithmetic number, because the mean of its divisors is an integer number (5314995).

Almost surely, 2^18222836 is an apocalyptic number.

It is an amenable number.

18222836 is a deficient number, since it is larger than the sum of its proper divisors (13667134).

18222836 is a wasteful number, since it uses less digits than its factorization.

18222836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555713 (or 4555711 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 18222836 is about 4268.8213830049. The cubic root of 18222836 is about 263.1511802666.

The spelling of 18222836 in words is "eighteen million, two hundred twenty-two thousand, eight hundred thirty-six".