6821398 has 4 divisors (see below), whose sum is σ = 10232100. Its totient is φ = 3410698.

The previous prime is 6821393. The next prime is 6821401. The reversal of 6821398 is 8931286.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1705348 + ... + 1705351.

It is an arithmetic number, because the mean of its divisors is an integer number (2558025).

Almost surely, 2^6821398 is an apocalyptic number.

6821398 is a deficient number, since it is larger than the sum of its proper divisors (3410702).

6821398 is a wasteful number, since it uses less digits than its factorization.

6821398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410701.

The product of its digits is 20736, while the sum is 37.

The square root of 6821398 is about 2611.7806186585. The cubic root of 6821398 is about 189.6521613741.

It can be divided in two parts, 682 and 1398, that added together give a triangular number (2080 = T₆₄).

The spelling of 6821398 in words is "six million, eight hundred twenty-one thousand, three hundred ninety-eight".