1129788220 has 24 divisors (see below), whose sum is σ = 2588242608. Its totient is φ = 410832000.

The previous prime is 1129788167. The next prime is 1129788239. The reversal of 1129788220 is 228879211.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2567481 + ... + 2567920.

It is an arithmetic number, because the mean of its divisors is an integer number (107843442).

Almost surely, 2^1129788220 is an apocalyptic number.

1129788220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1129788220 is an abundant number, since it is smaller than the sum of its proper divisors (1458454388).

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

1129788220 is a wasteful number, since it uses less digits than its factorization.

1129788220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135421 (or 5135419 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1129788220 is about 33612.3224428185. The cubic root of 1129788220 is about 1041.5153636526.

Subtracting from 1129788220 its reverse (228879211), we obtain a palindrome (900909009).

The spelling of 1129788220 in words is "one billion, one hundred twenty-nine million, seven hundred eighty-eight thousand, two hundred twenty".