6909947 has 6 divisors (see below), whose sum is σ = 7595364. Its totient is φ = 6281660.

The previous prime is 6909941. The next prime is 6909949. The reversal of 6909947 is 7499096.

6909947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6909947 - 2²⁰ = 5861371 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 6909898 and 6909907.

It is not an unprimeable number, because it can be changed into a prime (6909941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28433 + ... + 28674.

It is an arithmetic number, because the mean of its divisors is an integer number (1265894).

Almost surely, 2^6909947 is an apocalyptic number.

6909947 is a deficient number, since it is larger than the sum of its proper divisors (685417).

6909947 is a wasteful number, since it uses less digits than its factorization.

6909947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57129 (or 57118 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 6909947 is about 2628.6778045245. The cubic root of 6909947 is about 190.4692647948.

Subtracting from 6909947 its sum of digits (44), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 6909947 in words is "six million, nine hundred nine thousand, nine hundred forty-seven".