857443643 has 16 divisors (see below), whose sum is σ = 993991680. Its totient is φ = 724441536.

The previous prime is 857443621. The next prime is 857443669. The reversal of 857443643 is 346344758.

It is not a de Polignac number, because 857443643 - 2⁶ = 857443579 is a prime.

It is a super-2 number, since 2×857443643² = 1470419201842222898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857443594 and 857443603.

It is not an unprimeable number, because it can be changed into a prime (857463643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526196 + ... + 527822.

It is an arithmetic number, because the mean of its divisors is an integer number (62124480).

Almost surely, 2^857443643 is an apocalyptic number.

857443643 is a deficient number, since it is larger than the sum of its proper divisors (136548037).

857443643 is a wasteful number, since it uses less digits than its factorization.

857443643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666.

The product of its digits is 967680, while the sum is 44.

The square root of 857443643 is about 29282.1386343279. The cubic root of 857443643 is about 950.0253522320.

The spelling of 857443643 in words is "eight hundred fifty-seven million, four hundred forty-three thousand, six hundred forty-three".