856722405 has 64 divisors (see below), whose sum is σ = 1713954816. Its totient is φ = 355008000.

The previous prime is 856722403. The next prime is 856722409. The reversal of 856722405 is 504227658.

It is not a de Polignac number, because 856722405 - 2¹ = 856722403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856722401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 496945 + ... + 498665.

It is an arithmetic number, because the mean of its divisors is an integer number (26780544).

Almost surely, 2^856722405 is an apocalyptic number.

It is an amenable number.

856722405 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

856722405 is a wasteful number, since it uses less digits than its factorization.

856722405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178.

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 856722405 is about 29269.8207203256. The cubic root of 856722405 is about 949.7589065022.

The spelling of 856722405 in words is "eight hundred fifty-six million, seven hundred twenty-two thousand, four hundred five".