6443998 has 8 divisors (see below), whose sum is σ = 10544760. Its totient is φ = 2929080.

The previous prime is 6443981. The next prime is 6443999. The reversal of 6443998 is 8993446.

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

It is a super-2 number, since 2×6443998² = 83050220448008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443999) 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, 146433 + ... + 146476.

It is an arithmetic number, because the mean of its divisors is an integer number (1318095).

Almost surely, 2^6443998 is an apocalyptic number.

6443998 is a deficient number, since it is larger than the sum of its proper divisors (4100762).

6443998 is a wasteful number, since it uses less digits than its factorization.

6443998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292922.

The product of its digits is 186624, while the sum is 43.

The square root of 6443998 is about 2538.5031022238. The cubic root of 6443998 is about 186.0880417203.

The spelling of 6443998 in words is "six million, four hundred forty-three thousand, nine hundred ninety-eight".