1946136809 has 6 divisors (see below), whose sum is σ = 1951876026. Its totient is φ = 1940402400.

The previous prime is 1946136779. The next prime is 1946136811. The reversal of 1946136809 is 9086316491.

It can be written as a sum of positive squares in only one way, i.e., 1941283600 + 4853209 = 44060^2 + 2203^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1946136809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1946136209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 882302 + ... + 884504.

It is an arithmetic number, because the mean of its divisors is an integer number (325312671).

Almost surely, 2^1946136809 is an apocalyptic number.

It is an amenable number.

1946136809 is a deficient number, since it is larger than the sum of its proper divisors (5739217).

1946136809 is an frugal number, since it uses more digits than its factorization.

1946136809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4807 (or 2604 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1946136809 is about 44115.0406210852. The cubic root of 1946136809 is about 1248.5074043560.

The spelling of 1946136809 in words is "one billion, nine hundred forty-six million, one hundred thirty-six thousand, eight hundred nine".