857977 has 2 divisors, whose sum is σ = 857978. Its totient is φ = 857976.

The previous prime is 857963. The next prime is 857981. The reversal of 857977 is 779758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767376 + 90601 = 876^2 + 301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857977 is a prime.

It is a super-2 number, since 2×857977² = 1472249065058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428988 + 428989.

It is an arithmetic number, because the mean of its divisors is an integer number (428989).

2⁸⁵⁷⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

857977 is a deficient number, since it is larger than the sum of its proper divisors (1).

857977 is an equidigital number, since it uses as much as digits as its factorization.

857977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 43.

The square root of 857977 is about 926.2704788559. The cubic root of 857977 is about 95.0222293318.

The spelling of 857977 in words is "eight hundred fifty-seven thousand, nine hundred seventy-seven".