686947 has 2 divisors, whose sum is σ = 686948. Its totient is φ = 686946.

The previous prime is 686911. The next prime is 686963. The reversal of 686947 is 749686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686977) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343473 + 343474.

It is an arithmetic number, because the mean of its divisors is an integer number (343474).

2⁶⁸⁶⁹⁴⁷ is an apocalyptic number.

686947 is a deficient number, since it is larger than the sum of its proper divisors (1).

686947 is an equidigital number, since it uses as much as digits as its factorization.

686947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 686947 is about 828.8226589567. The cubic root of 686947 is about 88.2350380036.

The spelling of 686947 in words is "six hundred eighty-six thousand, nine hundred forty-seven".