857015040 has 144 divisors (see below), whose sum is σ = 3128203008. Its totient is φ = 195883008.

The previous prime is 857015017. The next prime is 857015059. The reversal of 857015040 is 40510758.

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 = 857014989 and 857015007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10939 + ... + 42821.

It is an arithmetic number, because the mean of its divisors is an integer number (21723632).

Almost surely, 2^857015040 is an apocalyptic number.

857015040 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 857015040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1564101504).

857015040 is an abundant number, since it is smaller than the sum of its proper divisors (2271187968).

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

857015040 is a wasteful number, since it uses less digits than its factorization.

857015040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31914 (or 31900 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 857015040 is about 29274.8192137885. The cubic root of 857015040 is about 949.8670321747.

Adding to 857015040 its reverse (40510758), we get a palindrome (897525798).

The spelling of 857015040 in words is "eight hundred fifty-seven million, fifteen thousand, forty".