857429885 has 8 divisors (see below), whose sum is σ = 1108063320. Its totient is φ = 633178944.

The previous prime is 857429879. The next prime is 857429941. The reversal of 857429885 is 588924758.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173659684 + 683770201 = 13178^2 + 26149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 857429885 - 2¹⁸ = 857167741 is a prime.

It is a super-2 number, since 2×857429885² = 1470372015382226450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 857429885.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6595550 + ... + 6595679.

It is an arithmetic number, because the mean of its divisors is an integer number (138507915).

Almost surely, 2^857429885 is an apocalyptic number.

It is an amenable number.

857429885 is a deficient number, since it is larger than the sum of its proper divisors (250633435).

857429885 is a wasteful number, since it uses less digits than its factorization.

857429885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13191247.

The product of its digits is 6451200, while the sum is 56.

The square root of 857429885 is about 29281.9037120198. The cubic root of 857429885 is about 950.0202710356.

The spelling of 857429885 in words is "eight hundred fifty-seven million, four hundred twenty-nine thousand, eight hundred eighty-five".