2639973917 has 16 divisors (see below), whose sum is σ = 3042496512. Its totient is φ = 2243862000.

The previous prime is 2639973893. The next prime is 2639973929. The reversal of 2639973917 is 7193799362.

It is a cyclic number.

It is not a de Polignac number, because 2639973917 - 2¹⁰ = 2639972893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639973967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553292 + ... + 558042.

It is an arithmetic number, because the mean of its divisors is an integer number (190156032).

Almost surely, 2^2639973917 is an apocalyptic number.

It is an amenable number.

2639973917 is a deficient number, since it is larger than the sum of its proper divisors (402522595).

2639973917 is a wasteful number, since it uses less digits than its factorization.

2639973917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408.

The product of its digits is 3857868, while the sum is 56.

The square root of 2639973917 is about 51380.6764941841. The cubic root of 2639973917 is about 1382.0800943567.

The spelling of 2639973917 in words is "two billion, six hundred thirty-nine million, nine hundred seventy-three thousand, nine hundred seventeen".