1222687872 has 320 divisors, whose sum is σ = 4407575040. Its totient is φ = 328458240.

The previous prime is 1222687861. The next prime is 1222687901. The reversal of 1222687872 is 2787862221.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 1233297 + ... + 1234287.

It is an arithmetic number, because the mean of its divisors is an integer number (13773672).

Almost surely, 2^1222687872 is an apocalyptic number.

1222687872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222687872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203787520).

1222687872 is an abundant number, since it is smaller than the sum of its proper divisors (3184887168).

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

1222687872 is an equidigital number, since it uses as much as digits as its factorization.

1222687872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1020 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 1222687872 is about 34966.9539994550. The cubic root of 1222687872 is about 1069.3138734540.

The spelling of 1222687872 in words is "one billion, two hundred twenty-two million, six hundred eighty-seven thousand, eight hundred seventy-two".