856641349 has 8 divisors (see below), whose sum is σ = 869742720. Its totient is φ = 843577056.

The previous prime is 856641337. The next prime is 856641367. The reversal of 856641349 is 943146658.

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 856641349 - 2¹³ = 856633157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856641299 and 856641308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856641389) 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, 39204 + ... + 57010.

It is an arithmetic number, because the mean of its divisors is an integer number (108717840).

Almost surely, 2^856641349 is an apocalyptic number.

It is an amenable number.

856641349 is a deficient number, since it is larger than the sum of its proper divisors (13101371).

856641349 is a wasteful number, since it uses less digits than its factorization.

856641349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18539.

The product of its digits is 622080, while the sum is 46.

The square root of 856641349 is about 29268.4360531956. The cubic root of 856641349 is about 949.7289527757.

The spelling of 856641349 in words is "eight hundred fifty-six million, six hundred forty-one thousand, three hundred forty-nine".