1222909920 has 384 divisors, whose sum is σ = 4615833600. Its totient is φ = 301418496.

The previous prime is 1222909889. The next prime is 1222909927. The reversal of 1222909920 is 299092221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222909927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3857602 + ... + 3857918.

It is an arithmetic number, because the mean of its divisors is an integer number (12020400).

Almost surely, 2^1222909920 is an apocalyptic number.

1222909920 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 1222909920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2307916800).

1222909920 is an abundant number, since it is smaller than the sum of its proper divisors (3392923680).

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

1222909920 is a wasteful number, since it uses less digits than its factorization.

1222909920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1222909920 is about 34970.1289674488. The cubic root of 1222909920 is about 1069.3786009669.

The spelling of 1222909920 in words is "one billion, two hundred twenty-two million, nine hundred nine thousand, nine hundred twenty".