857434783 has 4 divisors (see below), whose sum is σ = 857550600. Its totient is φ = 857318968.

The previous prime is 857434759. The next prime is 857434789. The reversal of 857434783 is 387434758.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 387434758 = 2 ⋅193717379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857434783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857434789) 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, 45985 + ... + 61882.

It is an arithmetic number, because the mean of its divisors is an integer number (214387650).

Almost surely, 2^857434783 is an apocalyptic number.

857434783 is a deficient number, since it is larger than the sum of its proper divisors (115817).

857434783 is a wasteful number, since it uses less digits than its factorization.

857434783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115816.

The product of its digits is 2257920, while the sum is 49.

The square root of 857434783 is about 29281.9873471730. The cubic root of 857434783 is about 950.0220800039.

The spelling of 857434783 in words is "eight hundred fifty-seven million, four hundred thirty-four thousand, seven hundred eighty-three".