6396890249 has 4 divisors (see below), whose sum is σ = 6675015936. Its totient is φ = 6118764564.

The previous prime is 6396890221. The next prime is 6396890257. The reversal of 6396890249 is 9420986936.

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 a de Polignac number, because none of the positive numbers 2^k-6396890249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6396890194 and 6396890203.

It is not an unprimeable number, because it can be changed into a prime (6396890749) 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, 139062809 + ... + 139062854.

It is an arithmetic number, because the mean of its divisors is an integer number (1668753984).

Almost surely, 2^6396890249 is an apocalyptic number.

It is an amenable number.

6396890249 is a deficient number, since it is larger than the sum of its proper divisors (278125687).

6396890249 is a wasteful number, since it uses less digits than its factorization.

6396890249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278125686.

The product of its (nonzero) digits is 5038848, while the sum is 56.

The square root of 6396890249 is about 79980.5616947018. The cubic root of 6396890249 is about 1856.3347725285.

The spelling of 6396890249 in words is "six billion, three hundred ninety-six million, eight hundred ninety thousand, two hundred forty-nine".