6978909 has 16 divisors (see below), whose sum is σ = 11194880. Its totient is φ = 3777840.

The previous prime is 6978901. The next prime is 6978911. The reversal of 6978909 is 9098796.

It is a happy number.

6978909 is nontrivially palindromic in base 11.

It is not a de Polignac number, because 6978909 - 2³ = 6978901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8347 + ... + 9144.

It is an arithmetic number, because the mean of its divisors is an integer number (699680).

Almost surely, 2^6978909 is an apocalyptic number.

It is an amenable number.

6978909 is a deficient number, since it is larger than the sum of its proper divisors (4215971).

6978909 is a wasteful number, since it uses less digits than its factorization.

6978909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17520.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 6978909 is about 2641.7624798607. The cubic root of 6978909 is about 191.1008029439.

It can be divided in two parts, 6978 and 909, that added together give a palindrome (7887).

The spelling of 6978909 in words is "six million, nine hundred seventy-eight thousand, nine hundred nine".