6909979 has 4 divisors (see below), whose sum is σ = 6945976. Its totient is φ = 6873984.

The previous prime is 6909967. The next prime is 6909983. The reversal of 6909979 is 9799096.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6909979 - 2⁹ = 6909467 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 (6909919) 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 3 ways as a sum of consecutive naturals, for example, 17709 + ... + 18094.

It is an arithmetic number, because the mean of its divisors is an integer number (1736494).

Almost surely, 2^6909979 is an apocalyptic number.

6909979 is a deficient number, since it is larger than the sum of its proper divisors (35997).

6909979 is a wasteful number, since it uses less digits than its factorization.

6909979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35996.

The product of its (nonzero) digits is 275562, while the sum is 49.

The square root of 6909979 is about 2628.6838912277. The cubic root of 6909979 is about 190.4695588157.

The spelling of 6909979 in words is "six million, nine hundred nine thousand, nine hundred seventy-nine".