83857213 has 16 divisors (see below), whose sum is σ = 92897280. Its totient is φ = 75065200.

The previous prime is 83857199. The next prime is 83857219. The reversal of 83857213 is 31275838.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83857213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83857219) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 350748 + ... + 350986.

It is an arithmetic number, because the mean of its divisors is an integer number (5806080).

Almost surely, 2^83857213 is an apocalyptic number.

It is an amenable number.

83857213 is a deficient number, since it is larger than the sum of its proper divisors (9040067).

83857213 is a wasteful number, since it uses less digits than its factorization.

83857213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its digits is 40320, while the sum is 37.

The square root of 83857213 is about 9157.3584073138. The cubic root of 83857213 is about 437.7036230917.

The spelling of 83857213 in words is "eighty-three million, eight hundred fifty-seven thousand, two hundred thirteen".