856222187 has 8 divisors (see below), whose sum is σ = 937850400. Its totient is φ = 778067584.

The previous prime is 856222181. The next prime is 856222243. The reversal of 856222187 is 781222658.

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 856222187 - 2¹⁸ = 855960043 is a prime.

It is a super-2 number, since 2×856222187² = 1466232867022125938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856222181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867887 + ... + 868872.

It is an arithmetic number, because the mean of its divisors is an integer number (117231300).

Almost surely, 2^856222187 is an apocalyptic number.

856222187 is a deficient number, since it is larger than the sum of its proper divisors (81628213).

856222187 is a wasteful number, since it uses less digits than its factorization.

856222187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736805.

The product of its digits is 107520, while the sum is 41.

The square root of 856222187 is about 29261.2745279491. The cubic root of 856222187 is about 949.5740239811.

The spelling of 856222187 in words is "eight hundred fifty-six million, two hundred twenty-two thousand, one hundred eighty-seven".