857879069 has 4 divisors (see below), whose sum is σ = 866208096. Its totient is φ = 849550044.

The previous prime is 857879063. The next prime is 857879101. The reversal of 857879069 is 960978758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 960978758 = 2 ⋅480489379.

It is a cyclic number.

It is not a de Polignac number, because 857879069 - 2⁴ = 857879053 is a prime.

It is a super-2 number, since 2×857879069² = 1471912994056613522, 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 = 857878999 and 857879017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857879063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4164359 + ... + 4164564.

It is an arithmetic number, because the mean of its divisors is an integer number (216552024).

Almost surely, 2^857879069 is an apocalyptic number.

It is an amenable number.

857879069 is a deficient number, since it is larger than the sum of its proper divisors (8329027).

857879069 is a wasteful number, since it uses less digits than its factorization.

857879069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8329026.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The square root of 857879069 is about 29289.5727008777. The cubic root of 857879069 is about 950.1861385957.

The spelling of 857879069 in words is "eight hundred fifty-seven million, eight hundred seventy-nine thousand, sixty-nine".