18051822 has 20 divisors (see below), whose sum is σ = 40449816. Its totient is φ = 6017220.

The previous prime is 18051811. The next prime is 18051823. The reversal of 18051822 is 22815081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18051823) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55554 + ... + 55877.

Almost surely, 2^18051822 is an apocalyptic number.

18051822 is an abundant number, since it is smaller than the sum of its proper divisors (22397994).

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

18051822 is a wasteful number, since it uses less digits than its factorization.

18051822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111445 (or 111436 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18051822 is about 4248.7435789890. The cubic root of 18051822 is about 262.3254022622.

The spelling of 18051822 in words is "eighteen million, fifty-one thousand, eight hundred twenty-two".