1222558920 has 160 divisors (see below), whose sum is σ = 4482846720. Its totient is φ = 296369280.

The previous prime is 1222558903. The next prime is 1222558937. The reversal of 1222558920 is 298552221.

1222558920 is a `hidden beast` number, since 12 + 2 + 2 + 558 + 92 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1222558903) and next prime (1222558937).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18489 + ... + 52791.

It is an arithmetic number, because the mean of its divisors is an integer number (28017792).

Almost surely, 2^1222558920 is an apocalyptic number.

1222558920 is a gapful number since it is divisible by the number (10) 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 1222558920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2241423360).

1222558920 is an abundant number, since it is smaller than the sum of its proper divisors (3260287800).

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

1222558920 is a wasteful number, since it uses less digits than its factorization.

1222558920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34337 (or 34324 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1222558920 is about 34965.1100384369. The cubic root of 1222558920 is about 1069.2762800464.

The spelling of 1222558920 in words is "one billion, two hundred twenty-two million, five hundred fifty-eight thousand, nine hundred twenty".