1222549878 has 48 divisors (see below), whose sum is σ = 2704339008. Its totient is φ = 368161200.

The previous prime is 1222549877. The next prime is 1222549891. The reversal of 1222549878 is 8789452221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222549873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113173 + ... + 123503.

It is an arithmetic number, because the mean of its divisors is an integer number (56340396).

Almost surely, 2^1222549878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222549878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352169504).

1222549878 is an abundant number, since it is smaller than the sum of its proper divisors (1481789130).

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

1222549878 is a wasteful number, since it uses less digits than its factorization.

1222549878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521 (or 10510 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 1222549878 is about 34964.9807378754. The cubic root of 1222549878 is about 1069.2736439308.

The spelling of 1222549878 in words is "one billion, two hundred twenty-two million, five hundred forty-nine thousand, eight hundred seventy-eight".