857392957 has 4 divisors (see below), whose sum is σ = 869138140. Its totient is φ = 845647776.

The previous prime is 857392891. The next prime is 857392961. The reversal of 857392957 is 759293758.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 655923321 + 201469636 = 25611^2 + 14194^2 .

It is a cyclic number.

It is not a de Polignac number, because 857392957 - 2¹¹ = 857390909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857392898 and 857392907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857392457) 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 3 ways as a sum of consecutive naturals, for example, 5872482 + ... + 5872627.

It is an arithmetic number, because the mean of its divisors is an integer number (217284535).

Almost surely, 2^857392957 is an apocalyptic number.

It is an amenable number.

857392957 is a deficient number, since it is larger than the sum of its proper divisors (11745183).

857392957 is a wasteful number, since it uses less digits than its factorization.

857392957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11745182.

The product of its digits is 4762800, while the sum is 55.

The square root of 857392957 is about 29281.2731451349. The cubic root of 857392957 is about 950.0066322713.

The spelling of 857392957 in words is "eight hundred fifty-seven million, three hundred ninety-two thousand, nine hundred fifty-seven".