1139891808 has 96 divisors (see below), whose sum is σ = 3273661440. Its totient is φ = 344424960.

The previous prime is 1139891801. The next prime is 1139891827. The reversal of 1139891808 is 8081989311.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139891801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417873 + ... + 420591.

It is an arithmetic number, because the mean of its divisors is an integer number (34100640).

Almost surely, 2^1139891808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1139891808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1636830720).

1139891808 is an abundant number, since it is smaller than the sum of its proper divisors (2133769632).

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

1139891808 is a wasteful number, since it uses less digits than its factorization.

1139891808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140 (or 3132 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 48.

The square root of 1139891808 is about 33762.2838090079. The cubic root of 1139891808 is about 1044.6108783745.

The spelling of 1139891808 in words is "one billion, one hundred thirty-nine million, eight hundred ninety-one thousand, eight hundred eight".