1216743822 has 64 divisors (see below), whose sum is σ = 3271933440. Its totient is φ = 327189888.

The previous prime is 1216743821. The next prime is 1216743823. The reversal of 1216743822 is 2283476121.

It is a happy number.

1216743822 is a `hidden beast` number, since 1 + 216 + 7 + 438 + 2 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1216743821) and next prime (1216743823).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216743821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88248 + ... + 101099.

It is an arithmetic number, because the mean of its divisors is an integer number (51123960).

Almost surely, 2^1216743822 is an apocalyptic number.

1216743822 is an abundant number, since it is smaller than the sum of its proper divisors (2055189618).

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

1216743822 is a wasteful number, since it uses less digits than its factorization.

1216743822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189382 (or 189376 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1216743822 is about 34881.8551972225. The cubic root of 1216743822 is about 1067.5782484457.

The spelling of 1216743822 in words is "one billion, two hundred sixteen million, seven hundred forty-three thousand, eight hundred twenty-two".