856947923 has 8 divisors (see below), whose sum is σ = 925197168. Its totient is φ = 789031584.

The previous prime is 856947907. The next prime is 856947943. The reversal of 856947923 is 329749658.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856947923 - 2⁴ = 856947907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856947943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77861 + ... + 88182.

It is an arithmetic number, because the mean of its divisors is an integer number (115649646).

Almost surely, 2^856947923 is an apocalyptic number.

856947923 is a deficient number, since it is larger than the sum of its proper divisors (68249245).

856947923 is a wasteful number, since it uses less digits than its factorization.

856947923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166453.

The product of its digits is 3265920, while the sum is 53.

The square root of 856947923 is about 29273.6728648798. The cubic root of 856947923 is about 949.8422352976.

The spelling of 856947923 in words is "eight hundred fifty-six million, nine hundred forty-seven thousand, nine hundred twenty-three".