2091839409 has 108 divisors (see below), whose sum is σ = 3723249348. Its totient is φ = 1126794240.

The previous prime is 2091839401. The next prime is 2091839411. The reversal of 2091839409 is 9049381902.

2091839409 is a `hidden beast` number, since 209 + 1 + 8 + 39 + 409 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 629006400 + 1462833009 = 25080^2 + 38247^2 .

It is not a de Polignac number, because 2091839409 - 2³ = 2091839401 is a prime.

It is a super-2 number, since 2×2091839409² = 8751584226090938562, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2091839401) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 6683037 + ... + 6683349.

It is an arithmetic number, because the mean of its divisors is an integer number (34474531).

Almost surely, 2^2091839409 is an apocalyptic number.

It is an amenable number.

2091839409 is a deficient number, since it is larger than the sum of its proper divisors (1631409939).

2091839409 is a wasteful number, since it uses less digits than its factorization.

2091839409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 2091839409 is about 45736.6309318909. The cubic root of 2091839409 is about 1278.9182366235.

The spelling of 2091839409 in words is "two billion, ninety-one million, eight hundred thirty-nine thousand, four hundred nine".