856955956 has 6 divisors (see below), whose sum is σ = 1499672930. Its totient is φ = 428477976.

The previous prime is 856955951. The next prime is 856955977. The reversal of 856955956 is 659559658.

It can be written as a sum of positive squares in only one way, i.e., 450288400 + 406667556 = 21220^2 + 20166^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 856955956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856955951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107119491 + ... + 107119498.

Almost surely, 2^856955956 is an apocalyptic number.

It is an amenable number.

856955956 is a deficient number, since it is larger than the sum of its proper divisors (642716974).

856955956 is a wasteful number, since it uses less digits than its factorization.

856955956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214238993 (or 214238991 counting only the distinct ones).

The product of its digits is 14580000, while the sum is 58.

The square root of 856955956 is about 29273.8100697535. The cubic root of 856955956 is about 949.8452032177.

The spelling of 856955956 in words is "eight hundred fifty-six million, nine hundred fifty-five thousand, nine hundred fifty-six".