857369 has 2 divisors, whose sum is σ = 857370. Its totient is φ = 857368.

The previous prime is 857357. The next prime is 857407. The reversal of 857369 is 963758.

It is an a-pointer prime, because the next prime (857407) can be obtained adding 857369 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 198025 = 812^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857369 is a prime.

It is a super-2 number, since 2×857369² = 1470163204322, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (857309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428684 + 428685.

It is an arithmetic number, because the mean of its divisors is an integer number (428685).

857369 is a Friedman number, since it can be written as (95^3-6)^(8-7), using all its digits and the basic arithmetic operations.

2⁸⁵⁷³⁶⁹ is an apocalyptic number.

It is an amenable number.

857369 is a deficient number, since it is larger than the sum of its proper divisors (1).

857369 is an equidigital number, since it uses as much as digits as its factorization.

857369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 857369 is about 925.9422228195. The cubic root of 857369 is about 94.9997783928. Note that the first 3 decimals are identical.

The spelling of 857369 in words is "eight hundred fifty-seven thousand, three hundred sixty-nine".