1139956209 has 12 divisors (see below), whose sum is σ = 1881832576. Its totient is φ = 651403512.

The previous prime is 1139956201. The next prime is 1139956231. The reversal of 1139956209 is 9026599311.

It is a happy number.

1139956209 is a `hidden beast` number, since 1 + 1 + 399 + 56 + 209 = 666.

It is not a de Polignac number, because 1139956209 - 2³ = 1139956201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1139956201) by changing a digit.

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, 9047209 + ... + 9047334.

Almost surely, 2^1139956209 is an apocalyptic number.

It is an amenable number.

1139956209 is a deficient number, since it is larger than the sum of its proper divisors (741876367).

1139956209 is a wasteful number, since it uses less digits than its factorization.

1139956209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18094556 (or 18094553 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 1139956209 is about 33763.2375372979. The cubic root of 1139956209 is about 1044.6305506270.

The spelling of 1139956209 in words is "one billion, one hundred thirty-nine million, nine hundred fifty-six thousand, two hundred nine".