861947 has 2 divisors, whose sum is σ = 861948. Its totient is φ = 861946.

The previous prime is 861941. The next prime is 861977. The reversal of 861947 is 749168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861947 - 2⁸ = 861691 is a prime.

It is not a weakly prime, because it can be changed into another prime (861941) 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 as a sum of consecutive naturals, namely, 430973 + 430974.

It is an arithmetic number, because the mean of its divisors is an integer number (430974).

2⁸⁶¹⁹⁴⁷ is an apocalyptic number.

861947 is a deficient number, since it is larger than the sum of its proper divisors (1).

861947 is an equidigital number, since it uses as much as digits as its factorization.

861947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 861947 is about 928.4110081209. The cubic root of 861947 is about 95.1685649926.

The spelling of 861947 in words is "eight hundred sixty-one thousand, nine hundred forty-seven".