1818191922 has 32 divisors (see below), whose sum is σ = 3884386752. Its totient is φ = 565361664.

The previous prime is 1818191911. The next prime is 1818191933. The reversal of 1818191922 is 2291918181.

It is a happy number.

1818191922 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1818191911) and next prime (1818191933).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67348 + ... + 90399.

It is an arithmetic number, because the mean of its divisors is an integer number (121387086).

Almost surely, 2^1818191922 is an apocalyptic number.

1818191922 is an abundant number, since it is smaller than the sum of its proper divisors (2066194830).

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

1818191922 is a wasteful number, since it uses less digits than its factorization.

1818191922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157882.

The product of its digits is 20736, while the sum is 42.

The square root of 1818191922 is about 42640.2617487276. The cubic root of 1818191922 is about 1220.5247053212.

The spelling of 1818191922 in words is "one billion, eight hundred eighteen million, one hundred ninety-one thousand, nine hundred twenty-two".