1222153920 has 588 divisors, whose sum is σ = 4877263296. Its totient is φ = 291133440.

The previous prime is 1222153913. The next prime is 1222153927. The reversal of 1222153920 is 293512221.

It is a happy number.

1222153920 is a `hidden beast` number, since 122 + 2 + 1 + 539 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1222153913) and next prime (1222153927).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1222153927) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 39424305 + ... + 39424335.

Almost surely, 2^1222153920 is an apocalyptic number.

1222153920 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 1222153920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2438631648).

1222153920 is an abundant number, since it is smaller than the sum of its proper divisors (3655109376).

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

1222153920 is an equidigital number, since it uses as much as digits as its factorization.

1222153920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1222153920 is about 34959.3180711524. The cubic root of 1222153920 is about 1069.1581931074.

The spelling of 1222153920 in words is "one billion, two hundred twenty-two million, one hundred fifty-three thousand, nine hundred twenty".