1139921865 has 12 divisors (see below), whose sum is σ = 1975864644. Its totient is φ = 607958304.

The previous prime is 1139921851. The next prime is 1139921921. The reversal of 1139921865 is 5681299311.

It can be written as a sum of positive squares in 2 ways, for example, as 322705296 + 817216569 = 17964^2 + 28587^2 .

It is not a de Polignac number, because 1139921865 - 2⁵ = 1139921833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 25331597 = 1139921865 / (1 + 1 + 3 + 9 + 9 + 2 + 1 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1139921865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12665754 + ... + 12665843.

It is an arithmetic number, because the mean of its divisors is an integer number (164655387).

Almost surely, 2^1139921865 is an apocalyptic number.

1139921865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1139921865 is a deficient number, since it is larger than the sum of its proper divisors (835942779).

1139921865 is a wasteful number, since it uses less digits than its factorization.

1139921865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25331608 (or 25331605 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1139921865 is about 33762.7289329521. The cubic root of 1139921865 is about 1044.6200598287.

The spelling of 1139921865 in words is "one billion, one hundred thirty-nine million, nine hundred twenty-one thousand, eight hundred sixty-five".