2639986809 has 4 divisors (see below), whose sum is σ = 3519982416. Its totient is φ = 1759991204.

The previous prime is 2639986807. The next prime is 2639986813. The reversal of 2639986809 is 9086899362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2639986809 - 2¹ = 2639986807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2639986807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439997799 + ... + 439997804.

It is an arithmetic number, because the mean of its divisors is an integer number (879995604).

Almost surely, 2^2639986809 is an apocalyptic number.

It is an amenable number.

2639986809 is a deficient number, since it is larger than the sum of its proper divisors (879995607).

2639986809 is an equidigital number, since it uses as much as digits as its factorization.

2639986809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879995606.

The product of its (nonzero) digits is 10077696, while the sum is 60.

The square root of 2639986809 is about 51380.8019497555. The cubic root of 2639986809 is about 1382.0823440945.

The spelling of 2639986809 in words is "two billion, six hundred thirty-nine million, nine hundred eighty-six thousand, eight hundred nine".