6398831 has 4 divisors (see below), whose sum is σ = 6417312. Its totient is φ = 6380352.

The previous prime is 6398813. The next prime is 6398857. The reversal of 6398831 is 1388936.

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 6398831 - 2⁶ = 6398767 is a prime.

It is a super-2 number, since 2×6398831² = 81890076333122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398881) 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, 8711 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (1604328).

Almost surely, 2^6398831 is an apocalyptic number.

6398831 is a deficient number, since it is larger than the sum of its proper divisors (18481).

6398831 is a wasteful number, since it uses less digits than its factorization.

6398831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18480.

The product of its digits is 31104, while the sum is 38.

The square root of 6398831 is about 2529.5910736718. The cubic root of 6398831 is about 185.6522484534.

The spelling of 6398831 in words is "six million, three hundred ninety-eight thousand, eight hundred thirty-one".