1908946809 has 48 divisors (see below), whose sum is σ = 3530716800. Its totient is φ = 964846080.

The previous prime is 1908946747. The next prime is 1908946817. The reversal of 1908946809 is 9086498091.

It is not a de Polignac number, because 1908946809 - 2¹¹ = 1908944761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1908947809) 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 47 ways as a sum of consecutive naturals, for example, 11584 + ... + 62865.

It is an arithmetic number, because the mean of its divisors is an integer number (73556600).

Almost surely, 2^1908946809 is an apocalyptic number.

It is an amenable number.

1908946809 is a deficient number, since it is larger than the sum of its proper divisors (1621769991).

1908946809 is a wasteful number, since it uses less digits than its factorization.

1908946809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74510 (or 74507 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 1908946809 is about 43691.4958430127. The cubic root of 1908946809 is about 1240.5033529218.

The spelling of 1908946809 in words is "one billion, nine hundred eight million, nine hundred forty-six thousand, eight hundred nine".