856419983 has 2 divisors, whose sum is σ = 856419984. Its totient is φ = 856419982.

The previous prime is 856419959. The next prime is 856419997. The reversal of 856419983 is 389914658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856419983 - 2¹⁴ = 856403599 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856419923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428209991 + 428209992.

It is an arithmetic number, because the mean of its divisors is an integer number (428209992).

Almost surely, 2^856419983 is an apocalyptic number.

856419983 is a deficient number, since it is larger than the sum of its proper divisors (1).

856419983 is an equidigital number, since it uses as much as digits as its factorization.

856419983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The square root of 856419983 is about 29264.6541582162. The cubic root of 856419983 is about 949.6471387581.

The spelling of 856419983 in words is "eight hundred fifty-six million, four hundred nineteen thousand, nine hundred eighty-three".