18231822 has 48 divisors (see below), whose sum is σ = 46082400. Its totient is φ = 5207328.

The previous prime is 18231821. The next prime is 18231827. The reversal of 18231822 is 22813281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231821) 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, 4698 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (960050).

Almost surely, 2^18231822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18231822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23041200).

18231822 is an abundant number, since it is smaller than the sum of its proper divisors (27850578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18231822 is a wasteful number, since it uses less digits than its factorization.

18231822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982 (or 2965 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 18231822 is about 4269.8737686260. The cubic root of 18231822 is about 263.1944279792.

The spelling of 18231822 in words is "eighteen million, two hundred thirty-one thousand, eight hundred twenty-two".