6439898 has 8 divisors (see below), whose sum is σ = 10168320. Its totient is φ = 3050460.

The previous prime is 6439837. The next prime is 6439903. The reversal of 6439898 is 8989346.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84698 + ... + 84773.

It is an arithmetic number, because the mean of its divisors is an integer number (1271040).

Almost surely, 2^6439898 is an apocalyptic number.

6439898 is a deficient number, since it is larger than the sum of its proper divisors (3728422).

6439898 is a wasteful number, since it uses less digits than its factorization.

6439898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169492.

The product of its digits is 373248, while the sum is 47.

The square root of 6439898 is about 2537.6954111950. The cubic root of 6439898 is about 186.0485671146.

It can be divided in two parts, 6439 and 898, that added together give a palindrome (7337).

The spelling of 6439898 in words is "six million, four hundred thirty-nine thousand, eight hundred ninety-eight".