856290247 has 4 divisors (see below), whose sum is σ = 860637096. Its totient is φ = 851943400.

The previous prime is 856290203. The next prime is 856290263. The reversal of 856290247 is 742092658.

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-856290247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856290287) 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 3 ways as a sum of consecutive naturals, for example, 2173129 + ... + 2173522.

It is an arithmetic number, because the mean of its divisors is an integer number (215159274).

Almost surely, 2^856290247 is an apocalyptic number.

856290247 is a deficient number, since it is larger than the sum of its proper divisors (4346849).

856290247 is a wasteful number, since it uses less digits than its factorization.

856290247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346848.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 856290247 is about 29262.4374753710. The cubic root of 856290247 is about 949.5991834537.

The spelling of 856290247 in words is "eight hundred fifty-six million, two hundred ninety thousand, two hundred forty-seven".