1213917822 has 24 divisors (see below), whose sum is σ = 2832475464. Its totient is φ = 373513104.

The previous prime is 1213917787. The next prime is 1213917829. The reversal of 1213917822 is 2287193121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213917829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2593608 + ... + 2594075.

It is an arithmetic number, because the mean of its divisors is an integer number (118019811).

Almost surely, 2^1213917822 is an apocalyptic number.

1213917822 is an abundant number, since it is smaller than the sum of its proper divisors (1618557642).

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

1213917822 is a wasteful number, since it uses less digits than its factorization.

1213917822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187704 (or 5187701 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1213917822 is about 34841.3234823248. The cubic root of 1213917822 is about 1066.7510913429.

The spelling of 1213917822 in words is "one billion, two hundred thirteen million, nine hundred seventeen thousand, eight hundred twenty-two".