1157991936 has 80 divisors (see below), whose sum is σ = 3247411200. Its totient is φ = 365672448.

The previous prime is 1157991931. The next prime is 1157991973. The reversal of 1157991936 is 6391997511.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157991931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9345 + ... + 49023.

It is an arithmetic number, because the mean of its divisors is an integer number (40592640).

Almost surely, 2^1157991936 is an apocalyptic number.

1157991936 is a gapful number since it is divisible by the number (16) 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 1157991936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1623705600).

1157991936 is an abundant number, since it is smaller than the sum of its proper divisors (2089419264).

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

1157991936 is an equidigital number, since it uses as much as digits as its factorization.

1157991936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39719 (or 39703 counting only the distinct ones).

The product of its digits is 459270, while the sum is 51.

The square root of 1157991936 is about 34029.2805683576. The cubic root of 1157991936 is about 1050.1109288699.

The spelling of 1157991936 in words is "one billion, one hundred fifty-seven million, nine hundred ninety-one thousand, nine hundred thirty-six".