856511754 has 128 divisors (see below), whose sum is σ = 2137344000. Its totient is φ = 223388928.

The previous prime is 856511753. The next prime is 856511813. The reversal of 856511754 is 457115658.

It is a super-2 number, since 2×856511754² = 1467224769480313032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (856511753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3740112 + ... + 3740340.

It is an arithmetic number, because the mean of its divisors is an integer number (16698000).

Almost surely, 2^856511754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856511754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068672000).

856511754 is an abundant number, since it is smaller than the sum of its proper divisors (1280832246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856511754 is a wasteful number, since it uses less digits than its factorization.

856511754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 168000, while the sum is 42.

The square root of 856511754 is about 29266.2220657194. Note that the first 3 decimals coincide. The cubic root of 856511754 is about 949.6810578463.

The spelling of 856511754 in words is "eight hundred fifty-six million, five hundred eleven thousand, seven hundred fifty-four".