1129865220 has 384 divisors, whose sum is σ = 4145541120. Its totient is φ = 252426240.

The previous prime is 1129865213. The next prime is 1129865227. The reversal of 1129865220 is 225689211.

1129865220 is a `hidden beast` number, since 1 + 129 + 8 + 6 + 522 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1129865213) and next prime (1129865227).

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

It is not an unprimeable number, because it can be changed into a prime (1129865227) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6765577 + ... + 6765743.

It is an arithmetic number, because the mean of its divisors is an integer number (10795680).

Almost surely, 2^1129865220 is an apocalyptic number.

1129865220 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 1129865220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2072770560).

1129865220 is an abundant number, since it is smaller than the sum of its proper divisors (3015675900).

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

1129865220 is a wasteful number, since it uses less digits than its factorization.

1129865220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1129865220 is about 33613.4678365681. The cubic root of 1129865220 is about 1041.5390243882.

The spelling of 1129865220 in words is "one billion, one hundred twenty-nine million, eight hundred sixty-five thousand, two hundred twenty".