851947 has 4 divisors (see below), whose sum is σ = 854440. Its totient is φ = 849456.

The previous prime is 851899. The next prime is 851953. The reversal of 851947 is 749158.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633 + ... + 1450.

It is an arithmetic number, because the mean of its divisors is an integer number (213610).

2⁸⁵¹⁹⁴⁷ is an apocalyptic number.

851947 is a deficient number, since it is larger than the sum of its proper divisors (2493).

851947 is a wasteful number, since it uses less digits than its factorization.

851947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492.

The product of its digits is 10080, while the sum is 34.

The square root of 851947 is about 923.0097507611. The cubic root of 851947 is about 94.7990952812.

The spelling of 851947 in words is "eight hundred fifty-one thousand, nine hundred forty-seven".