856142040 has 128 divisors (see below), whose sum is σ = 2830544640. Its totient is φ = 205825536.

The previous prime is 856142011. The next prime is 856142047. The reversal of 856142040 is 40241658.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 856141989 and 856142007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856142047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60699 + ... + 73461.

It is an arithmetic number, because the mean of its divisors is an integer number (22113630).

Almost surely, 2^856142040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856142040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415272320).

856142040 is an abundant number, since it is smaller than the sum of its proper divisors (1974402600).

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

856142040 is a wasteful number, since it uses less digits than its factorization.

856142040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12833 (or 12829 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 856142040 is about 29259.9049895928. The cubic root of 856142040 is about 949.5443946454.

Adding to 856142040 its reverse (40241658), we get a palindrome (896383698).

The spelling of 856142040 in words is "eight hundred fifty-six million, one hundred forty-two thousand, forty".