856396966 has 4 divisors (see below), whose sum is σ = 1284595452. Its totient is φ = 428198482.

The previous prime is 856396963. The next prime is 856396967. The reversal of 856396966 is 669693658.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 856396966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856396963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214099240 + ... + 214099243.

It is an arithmetic number, because the mean of its divisors is an integer number (321148863).

Almost surely, 2^856396966 is an apocalyptic number.

856396966 is a deficient number, since it is larger than the sum of its proper divisors (428198486).

856396966 is a wasteful number, since it uses less digits than its factorization.

856396966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428198485.

The product of its digits is 12597120, while the sum is 58.

The square root of 856396966 is about 29264.2608996024. The cubic root of 856396966 is about 949.6386311627.

The spelling of 856396966 in words is "eight hundred fifty-six million, three hundred ninety-six thousand, nine hundred sixty-six".