6396961809 has 24 divisors (see below), whose sum is σ = 9924925728. Its totient is φ = 3654262080.

The previous prime is 6396961801. The next prime is 6396961859. The reversal of 6396961809 is 9081696936.

It is not a de Polignac number, because 6396961809 - 2³ = 6396961801 is a prime.

It is a super-2 number, since 2×6396961809² = 81842240771609104962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6396961801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 746469 + ... + 754989.

It is an arithmetic number, because the mean of its divisors is an integer number (413538572).

Almost surely, 2^6396961809 is an apocalyptic number.

It is an amenable number.

6396961809 is a deficient number, since it is larger than the sum of its proper divisors (3527963919).

6396961809 is a wasteful number, since it uses less digits than its factorization.

6396961809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13645 (or 13638 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 57.

The square root of 6396961809 is about 79981.0090521494. The cubic root of 6396961809 is about 1856.3416945805.

The spelling of 6396961809 in words is "six billion, three hundred ninety-six million, nine hundred sixty-one thousand, eight hundred nine".