856734973 has 2 divisors, whose sum is σ = 856734974. Its totient is φ = 856734972.

The previous prime is 856734961. The next prime is 856735007. The reversal of 856734973 is 379437658.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649893049 + 206841924 = 25493^2 + 14382^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856734973 is a prime.

It is a super-2 number, since 2×856734973² = 1467989627922621458, 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 856734973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856734173) 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 as a sum of consecutive naturals, namely, 428367486 + 428367487.

It is an arithmetic number, because the mean of its divisors is an integer number (428367487).

Almost surely, 2^856734973 is an apocalyptic number.

It is an amenable number.

856734973 is a deficient number, since it is larger than the sum of its proper divisors (1).

856734973 is an equidigital number, since it uses as much as digits as its factorization.

856734973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 52.

The square root of 856734973 is about 29270.0354116629. The cubic root of 856734973 is about 949.7635507571.

The spelling of 856734973 in words is "eight hundred fifty-six million, seven hundred thirty-four thousand, nine hundred seventy-three".