856354799 has 2 divisors, whose sum is σ = 856354800. Its totient is φ = 856354798.

The previous prime is 856354771. The next prime is 856354813. The reversal of 856354799 is 997453658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856354799 - 2¹⁶ = 856289263 is a 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 (856354739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428177399 + 428177400.

It is an arithmetic number, because the mean of its divisors is an integer number (428177400).

Almost surely, 2^856354799 is an apocalyptic number.

856354799 is a deficient number, since it is larger than the sum of its proper divisors (1).

856354799 is an equidigital number, since it uses as much as digits as its factorization.

856354799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 56.

The square root of 856354799 is about 29263.5404385730. The cubic root of 856354799 is about 949.6230449058.

The spelling of 856354799 in words is "eight hundred fifty-six million, three hundred fifty-four thousand, seven hundred ninety-nine".