1222591888 has 120 divisors (see below), whose sum is σ = 2882273856. Its totient is φ = 491754240.

The previous prime is 1222591883. The next prime is 1222591891. The reversal of 1222591888 is 8881952221.

Its product of digits (184320) is a multiple of the sum of its prime divisors (384).

It is not an unprimeable number, because it can be changed into a prime (1222591883) 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, 3982231 + ... + 3982537.

Almost surely, 2^1222591888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222591888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441136928).

1222591888 is an abundant number, since it is smaller than the sum of its proper divisors (1659681968).

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

1222591888 is a wasteful number, since it uses less digits than its factorization.

1222591888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 384 counting only the distinct ones).

The product of its digits is 184320, while the sum is 46.

The square root of 1222591888 is about 34965.5814766464. The cubic root of 1222591888 is about 1069.2858914669.

The spelling of 1222591888 in words is "one billion, two hundred twenty-two million, five hundred ninety-one thousand, eight hundred eighty-eight".