857218444 has 6 divisors (see below), whose sum is σ = 1500132284. Its totient is φ = 428609220.

The previous prime is 857218433. The next prime is 857218451. The reversal of 857218444 is 444812758.

It is a super-2 number, since 2×857218444² = 1469646921467562272, 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 857218444.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 107152302 + ... + 107152309.

Almost surely, 2^857218444 is an apocalyptic number.

It is an amenable number.

857218444 is a deficient number, since it is larger than the sum of its proper divisors (642913840).

857218444 is a wasteful number, since it uses less digits than its factorization.

857218444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214304615 (or 214304613 counting only the distinct ones).

The product of its digits is 286720, while the sum is 43.

The square root of 857218444 is about 29278.2930513375. The cubic root of 857218444 is about 949.9421733961.

The spelling of 857218444 in words is "eight hundred fifty-seven million, two hundred eighteen thousand, four hundred forty-four".