856722443 has 2 divisors, whose sum is σ = 856722444. Its totient is φ = 856722442.

The previous prime is 856722409. The next prime is 856722523. The reversal of 856722443 is 344227658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856722443 - 2¹⁶ = 856656907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856722443.

It is not a weakly prime, because it can be changed into another prime (856722403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428361221 + 428361222.

It is an arithmetic number, because the mean of its divisors is an integer number (428361222).

Almost surely, 2^856722443 is an apocalyptic number.

856722443 is a deficient number, since it is larger than the sum of its proper divisors (1).

856722443 is an equidigital number, since it uses as much as digits as its factorization.

856722443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 41.

The square root of 856722443 is about 29269.8213694583. The cubic root of 856722443 is about 949.7589205444.

The spelling of 856722443 in words is "eight hundred fifty-six million, seven hundred twenty-two thousand, four hundred forty-three".