6820989 has 8 divisors (see below), whose sum is σ = 10393920. Its totient is φ = 3897696.

The previous prime is 6820973. The next prime is 6820991. The reversal of 6820989 is 9890286.

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

It is not a de Polignac number, because 6820989 - 2⁴ = 6820973 is a prime.

6820989 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6820989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6820909) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 162384 + ... + 162425.

It is an arithmetic number, because the mean of its divisors is an integer number (1299240).

Almost surely, 2^6820989 is an apocalyptic number.

It is an amenable number.

6820989 is a deficient number, since it is larger than the sum of its proper divisors (3572931).

6820989 is a wasteful number, since it uses less digits than its factorization.

6820989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324819.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 6820989 is about 2611.7023184123. The cubic root of 6820989 is about 189.6483708859.

The spelling of 6820989 in words is "six million, eight hundred twenty thousand, nine hundred eighty-nine".