856549869 has 8 divisors (see below), whose sum is σ = 1305218880. Its totient is φ = 489457056.

The previous prime is 856549843. The next prime is 856549891. The reversal of 856549869 is 968945658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 856549869 - 2⁸ = 856549613 is a prime.

It is a super-2 number, since 2×856549869² = 1467355356167834322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856549069) 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, 20394024 + ... + 20394065.

It is an arithmetic number, because the mean of its divisors is an integer number (163152360).

Almost surely, 2^856549869 is an apocalyptic number.

It is an amenable number.

856549869 is a deficient number, since it is larger than the sum of its proper divisors (448669011).

856549869 is a wasteful number, since it uses less digits than its factorization.

856549869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40788099.

The product of its digits is 18662400, while the sum is 60.

The square root of 856549869 is about 29266.8732357934. The cubic root of 856549869 is about 949.6951446569.

It can be divided in two parts, 856 and 549869, that added together give a triangular number (550725 = T₁₀₄₉).

The spelling of 856549869 in words is "eight hundred fifty-six million, five hundred forty-nine thousand, eight hundred sixty-nine".