856729347 has 4 divisors (see below), whose sum is σ = 1142305800. Its totient is φ = 571152896.

The previous prime is 856729337. The next prime is 856729409. The reversal of 856729347 is 743927658.

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

It is a cyclic number.

It is not a de Polignac number, because 856729347 - 2⁸ = 856729091 is a prime.

It is a super-2 number, since 2×856729347² = 1467970348022092818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 856729347.

It is not an unprimeable number, because it can be changed into a prime (856729327) 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, 142788222 + ... + 142788227.

It is an arithmetic number, because the mean of its divisors is an integer number (285576450).

Almost surely, 2^856729347 is an apocalyptic number.

856729347 is a deficient number, since it is larger than the sum of its proper divisors (285576453).

856729347 is a wasteful number, since it uses less digits than its factorization.

856729347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285576452.

The product of its digits is 2540160, while the sum is 51.

The square root of 856729347 is about 29269.9393063942. The cubic root of 856729347 is about 949.7614717861.

The spelling of 856729347 in words is "eight hundred fifty-six million, seven hundred twenty-nine thousand, three hundred forty-seven".