856662849 has 12 divisors (see below), whose sum is σ = 1414173696. Its totient is φ = 489521592.

The previous prime is 856662847. The next prime is 856662857. The reversal of 856662849 is 948266658.

It is a happy number.

It is not a de Polignac number, because 856662849 - 2¹ = 856662847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 856662795 and 856662804.

It is not an unprimeable number, because it can be changed into a prime (856662847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6798849 + ... + 6798974.

It is an arithmetic number, because the mean of its divisors is an integer number (117847808).

Almost surely, 2^856662849 is an apocalyptic number.

It is an amenable number.

856662849 is a deficient number, since it is larger than the sum of its proper divisors (557510847).

856662849 is a wasteful number, since it uses less digits than its factorization.

856662849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13597836 (or 13597833 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 856662849 is about 29268.8033407586. The cubic root of 856662849 is about 949.7368981473.

The spelling of 856662849 in words is "eight hundred fifty-six million, six hundred sixty-two thousand, eight hundred forty-nine".