857172240 has 160 divisors (see below), whose sum is σ = 3024806400. Its totient is φ = 222981120.

The previous prime is 857172221. The next prime is 857172247. The reversal of 857172240 is 42271758.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 857172195 and 857172204.

It is not an unprimeable number, because it can be changed into a prime (857172247) 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 31 ways as a sum of consecutive naturals, for example, 83721 + ... + 93399.

It is an arithmetic number, because the mean of its divisors is an integer number (18905040).

Almost surely, 2^857172240 is an apocalyptic number.

857172240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857172240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1512403200).

857172240 is an abundant number, since it is smaller than the sum of its proper divisors (2167634160).

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

857172240 is a wasteful number, since it uses less digits than its factorization.

857172240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9742 (or 9730 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 857172240 is about 29277.5039919731. The cubic root of 857172240 is about 949.9251058225.

The spelling of 857172240 in words is "eight hundred fifty-seven million, one hundred seventy-two thousand, two hundred forty".