6399851 has 4 divisors (see below), whose sum is σ = 6405000. Its totient is φ = 6394704.

The previous prime is 6399847. The next prime is 6399859. The reversal of 6399851 is 1589936.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6399851 - 2² = 6399847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6399799 and 6399808.

It is not an unprimeable number, because it can be changed into a prime (6399859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575 + ... + 3623.

It is an arithmetic number, because the mean of its divisors is an integer number (1601250).

Almost surely, 2^6399851 is an apocalyptic number.

6399851 is a deficient number, since it is larger than the sum of its proper divisors (5149).

6399851 is a wasteful number, since it uses less digits than its factorization.

6399851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5148.

The product of its digits is 58320, while the sum is 41.

The square root of 6399851 is about 2529.7926792526. The cubic root of 6399851 is about 185.6621125068.

The spelling of 6399851 in words is "six million, three hundred ninety-nine thousand, eight hundred fifty-one".