6399771 has 8 divisors (see below), whose sum is σ = 9752064. Its totient is φ = 3657000.

The previous prime is 6399761. The next prime is 6399793. The reversal of 6399771 is 1779936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6399771 - 2⁵ = 6399739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152355 + ... + 152396.

It is an arithmetic number, because the mean of its divisors is an integer number (1219008).

Almost surely, 2^6399771 is an apocalyptic number.

6399771 is a deficient number, since it is larger than the sum of its proper divisors (3352293).

6399771 is a wasteful number, since it uses less digits than its factorization.

6399771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304761.

The product of its digits is 71442, while the sum is 42.

The square root of 6399771 is about 2529.7768676308. The cubic root of 6399771 is about 185.6613388934.

The spelling of 6399771 in words is "six million, three hundred ninety-nine thousand, seven hundred seventy-one".