1139581836 has 18 divisors (see below), whose sum is σ = 2880609732. Its totient is φ = 379860600.

The previous prime is 1139581823. The next prime is 1139581901. The reversal of 1139581836 is 6381859311.

It is a happy number.

1139581836 is a `hidden beast` number, since 1 + 1 + 39 + 581 + 8 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1139581836² = 2597293521882261792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1139581791 and 1139581800.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15827490 + ... + 15827561.

It is an arithmetic number, because the mean of its divisors is an integer number (160033874).

Almost surely, 2^1139581836 is an apocalyptic number.

It is an amenable number.

1139581836 is an abundant number, since it is smaller than the sum of its proper divisors (1741027896).

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

1139581836 is a wasteful number, since it uses less digits than its factorization.

1139581836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31655061 (or 31655056 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1139581836 is about 33757.6929898949. The cubic root of 1139581836 is about 1044.5161824055.

The spelling of 1139581836 in words is "one billion, one hundred thirty-nine million, five hundred eighty-one thousand, eight hundred thirty-six".