6786989 has 4 divisors (see below), whose sum is σ = 7404000. Its totient is φ = 6169980.

The previous prime is 6786943. The next prime is 6787019. The reversal of 6786989 is 9896876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6786989 is a prime.

It is a super-2 number, since 2×6786989² = 92126439372242, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6786989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6786919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308489 + ... + 308510.

It is an arithmetic number, because the mean of its divisors is an integer number (1851000).

Almost surely, 2^6786989 is an apocalyptic number.

It is an amenable number.

6786989 is a deficient number, since it is larger than the sum of its proper divisors (617011).

6786989 is a wasteful number, since it uses less digits than its factorization.

6786989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617010.

The product of its digits is 1306368, while the sum is 53.

The square root of 6786989 is about 2605.1850222201. The cubic root of 6786989 is about 189.3327378670.

It can be divided in two parts, 678 and 6989, that added together give a palindrome (7667).

The spelling of 6786989 in words is "six million, seven hundred eighty-six thousand, nine hundred eighty-nine".