2109904639 has 2 divisors, whose sum is σ = 2109904640. Its totient is φ = 2109904638.

The previous prime is 2109904627. The next prime is 2109904691. The reversal of 2109904639 is 9364099012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2109904639 - 2¹¹ = 2109902591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2109904595 and 2109904604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109904439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054952319 + 1054952320.

It is an arithmetic number, because the mean of its divisors is an integer number (1054952320).

Almost surely, 2^2109904639 is an apocalyptic number.

2109904639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109904639 is an equidigital number, since it uses as much as digits as its factorization.

2109904639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 2109904639 is about 45933.6982943895. The cubic root of 2109904639 is about 1282.5892896857.

The spelling of 2109904639 in words is "two billion, one hundred nine million, nine hundred four thousand, six hundred thirty-nine".