1156211840 has 256 divisors, whose sum is σ = 3378240000. Its totient is φ = 377524224.

The previous prime is 1156211827. The next prime is 1156211843. The reversal of 1156211840 is 481126511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156211843) 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 31 ways as a sum of consecutive naturals, for example, 5048846 + ... + 5049074.

It is an arithmetic number, because the mean of its divisors is an integer number (13196250).

Almost surely, 2^1156211840 is an apocalyptic number.

1156211840 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 1156211840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1689120000).

1156211840 is an abundant number, since it is smaller than the sum of its proper divisors (2222028160).

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

1156211840 is an equidigital number, since it uses as much as digits as its factorization.

1156211840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 1156211840 is about 34003.1151514093. The cubic root of 1156211840 is about 1049.5725667651.

The spelling of 1156211840 in words is "one billion, one hundred fifty-six million, two hundred eleven thousand, eight hundred forty".