857806493 has 2 divisors, whose sum is σ = 857806494. Its totient is φ = 857806492.

The previous prime is 857806463. The next prime is 857806511. The reversal of 857806493 is 394608758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637966564 + 219839929 = 25258^2 + 14827^2 .

It is a cyclic number.

It is not a de Polignac number, because 857806493 - 2¹⁰ = 857805469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857806463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428903246 + 428903247.

It is an arithmetic number, because the mean of its divisors is an integer number (428903247).

Almost surely, 2^857806493 is an apocalyptic number.

It is an amenable number.

857806493 is a deficient number, since it is larger than the sum of its proper divisors (1).

857806493 is an equidigital number, since it uses as much as digits as its factorization.

857806493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 857806493 is about 29288.3337354654. Note that the first 3 decimals coincide. The cubic root of 857806493 is about 950.1593428011.

The spelling of 857806493 in words is "eight hundred fifty-seven million, eight hundred six thousand, four hundred ninety-three".