857249211 has 16 divisors (see below), whose sum is σ = 1406768384. Its totient is φ = 452175264.

The previous prime is 857249207. The next prime is 857249213. The reversal of 857249211 is 112942758.

It is not a de Polignac number, because 857249211 - 2² = 857249207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 857249211.

It is not an unprimeable number, because it can be changed into a prime (857249213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569781 + ... + 1570326.

It is an arithmetic number, because the mean of its divisors is an integer number (87923024).

Almost surely, 2^857249211 is an apocalyptic number.

857249211 is a deficient number, since it is larger than the sum of its proper divisors (549519173).

857249211 is a wasteful number, since it uses less digits than its factorization.

857249211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140130.

The product of its digits is 40320, while the sum is 39.

The square root of 857249211 is about 29278.8184700134. The cubic root of 857249211 is about 949.9535382633.

The spelling of 857249211 in words is "eight hundred fifty-seven million, two hundred forty-nine thousand, two hundred eleven".