84456857 has 2 divisors, whose sum is σ = 84456858. Its totient is φ = 84456856.

The previous prime is 84456847. The next prime is 84456863. The reversal of 84456857 is 75865448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50537881 + 33918976 = 7109^2 + 5824^2 .

It is a cyclic number.

It is not a de Polignac number, because 84456857 - 2⁶ = 84456793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84456847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42228428 + 42228429.

It is an arithmetic number, because the mean of its divisors is an integer number (42228429).

Almost surely, 2^84456857 is an apocalyptic number.

It is an amenable number.

84456857 is a deficient number, since it is larger than the sum of its proper divisors (1).

84456857 is an equidigital number, since it uses as much as digits as its factorization.

84456857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1075200, while the sum is 47.

The square root of 84456857 is about 9190.0411859795. The cubic root of 84456857 is about 438.7444527076.

The spelling of 84456857 in words is "eighty-four million, four hundred fifty-six thousand, eight hundred fifty-seven".