705857 has 4 divisors (see below), whose sum is σ = 747396. Its totient is φ = 664320.

The previous prime is 705841. The next prime is 705863. The reversal of 705857 is 758507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758507 = 67 ⋅11321.

It can be written as a sum of positive squares in 2 ways, for example, as 579121 + 126736 = 761^2 + 356^2 .

It is a cyclic number.

It is not a de Polignac number, because 705857 - 2⁴ = 705841 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 705857.

It is not an unprimeable number, because it can be changed into a prime (705827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20744 + ... + 20777.

It is an arithmetic number, because the mean of its divisors is an integer number (186849).

2⁷⁰⁵⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

705857 is a deficient number, since it is larger than the sum of its proper divisors (41539).

705857 is a wasteful number, since it uses less digits than its factorization.

705857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41538.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 705857 is about 840.1529622634. The cubic root of 705857 is about 89.0373533397.

Subtracting 705857 from its reverse (758507), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 705857 in words is "seven hundred five thousand, eight hundred fifty-seven".