6939847 has 4 divisors (see below), whose sum is σ = 6945120. Its totient is φ = 6934576.

The previous prime is 6939827. The next prime is 6939887. The reversal of 6939847 is 7489396.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6939847 is a prime.

It is a super-2 number, since 2×6939847² = 96322952766818, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6939797 and 6939806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179 + ... + 3907.

It is an arithmetic number, because the mean of its divisors is an integer number (1736280).

Almost surely, 2^6939847 is an apocalyptic number.

6939847 is a deficient number, since it is larger than the sum of its proper divisors (5273).

6939847 is a wasteful number, since it uses less digits than its factorization.

6939847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272.

The product of its digits is 326592, while the sum is 46.

The square root of 6939847 is about 2634.3589353010. The cubic root of 6939847 is about 190.7435957167.

The spelling of 6939847 in words is "six million, nine hundred thirty-nine thousand, eight hundred forty-seven".