856398801 has 4 divisors (see below), whose sum is σ = 1141865072. Its totient is φ = 570932532.

The previous prime is 856398773. The next prime is 856398811. The reversal of 856398801 is 108893658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 856398801 - 2⁹ = 856398289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856398811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142733131 + ... + 142733136.

It is an arithmetic number, because the mean of its divisors is an integer number (285466268).

Almost surely, 2^856398801 is an apocalyptic number.

It is an amenable number.

856398801 is a deficient number, since it is larger than the sum of its proper divisors (285466271).

856398801 is a wasteful number, since it uses less digits than its factorization.

856398801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285466270.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 856398801 is about 29264.2922518212. The cubic root of 856398801 is about 949.6393094251.

The spelling of 856398801 in words is "eight hundred fifty-six million, three hundred ninety-eight thousand, eight hundred one".