6399488947 has 4 divisors (see below), whose sum is σ = 6399656640. Its totient is φ = 6399321256.

The previous prime is 6399488941. The next prime is 6399488969. The reversal of 6399488947 is 7498849936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6399488947 - 2³ = 6399488939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6399488941) 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, 4254 + ... + 113212.

It is an arithmetic number, because the mean of its divisors is an integer number (1599914160).

Almost surely, 2^6399488947 is an apocalyptic number.

6399488947 is a deficient number, since it is larger than the sum of its proper divisors (167693).

6399488947 is a wasteful number, since it uses less digits than its factorization.

6399488947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167692.

The product of its digits is 94058496, while the sum is 67.

The square root of 6399488947 is about 79996.8058549840. The cubic root of 6399488947 is about 1856.5861134234.

The spelling of 6399488947 in words is "six billion, three hundred ninety-nine million, four hundred eighty-eight thousand, nine hundred forty-seven".