84579857 has 2 divisors, whose sum is σ = 84579858. Its totient is φ = 84579856.

The previous prime is 84579853. The next prime is 84579877. The reversal of 84579857 is 75897548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83740801 + 839056 = 9151^2 + 916^2 .

It is a cyclic number.

It is not a de Polignac number, because 84579857 - 2² = 84579853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84579799 and 84579808.

It is not a weakly prime, because it can be changed into another prime (84579851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42289928 + 42289929.

It is an arithmetic number, because the mean of its divisors is an integer number (42289929).

Almost surely, 2^84579857 is an apocalyptic number.

It is an amenable number.

84579857 is a deficient number, since it is larger than the sum of its proper divisors (1).

84579857 is an equidigital number, since it uses as much as digits as its factorization.

84579857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 53.

The square root of 84579857 is about 9196.7307778362. The cubic root of 84579857 is about 438.9573400638.

The spelling of 84579857 in words is "eighty-four million, five hundred seventy-nine thousand, eight hundred fifty-seven".