857213919 has 6 divisors (see below), whose sum is σ = 1238197896. Its totient is φ = 571475940.

The previous prime is 857213897. The next prime is 857213923. The reversal of 857213919 is 919312758.

It is not a de Polignac number, because 857213919 - 2¹¹ = 857211871 is a prime.

It is a super-2 number, since 2×857213919² = 1469631405854677122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857213989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47622987 + ... + 47623004.

It is an arithmetic number, because the mean of its divisors is an integer number (206366316).

Almost surely, 2^857213919 is an apocalyptic number.

857213919 is a deficient number, since it is larger than the sum of its proper divisors (380983977).

857213919 is a wasteful number, since it uses less digits than its factorization.

857213919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95245997 (or 95245994 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 857213919 is about 29278.2157755557. The cubic root of 857213919 is about 949.9405019062.

The spelling of 857213919 in words is "eight hundred fifty-seven million, two hundred thirteen thousand, nine hundred nineteen".