18381822 has 32 divisors (see below), whose sum is σ = 38989824. Its totient is φ = 5767200.

The previous prime is 18381821. The next prime is 18381827. The reversal of 18381822 is 22818381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5547 + ... + 8217.

It is an arithmetic number, because the mean of its divisors is an integer number (1218432).

Almost surely, 2^18381822 is an apocalyptic number.

18381822 is an abundant number, since it is smaller than the sum of its proper divisors (20608002).

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

18381822 is a wasteful number, since it uses less digits than its factorization.

18381822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744.

The product of its digits is 6144, while the sum is 33.

The square root of 18381822 is about 4287.4027102664. The cubic root of 18381822 is about 263.9142570495.

The spelling of 18381822 in words is "eighteen million, three hundred eighty-one thousand, eight hundred twenty-two".