1157909220 has 144 divisors (see below), whose sum is σ = 3847072320. Its totient is φ = 280159488.

The previous prime is 1157909197. The next prime is 1157909227. The reversal of 1157909220 is 229097511.

It is a super-2 number, since 2×1157909220² = 2681507523522016800, which contains 22 as substring.

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 (1157909227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133867 + ... + 142253.

It is an arithmetic number, because the mean of its divisors is an integer number (26715780).

Almost surely, 2^1157909220 is an apocalyptic number.

1157909220 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 1157909220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1923536160).

1157909220 is an abundant number, since it is smaller than the sum of its proper divisors (2689163100).

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

1157909220 is a wasteful number, since it uses less digits than its factorization.

1157909220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8474 (or 8469 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 1157909220 is about 34028.0651815527. The cubic root of 1157909220 is about 1050.0859249411.

The spelling of 1157909220 in words is "one billion, one hundred fifty-seven million, nine hundred nine thousand, two hundred twenty".