857040 has 40 divisors (see below), whose sum is σ = 2657568. Its totient is φ = 228480.

The previous prime is 857039. The next prime is 857047. The reversal of 857040 is 40758.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 857040.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 857040.

It is not an unprimeable number, because it can be changed into a prime (857047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546 + ... + 2025.

2⁸⁵⁷⁰⁴⁰ is an apocalyptic number.

857040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857040 is an abundant number, since it is smaller than the sum of its proper divisors (1800528).

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

857040 is a wasteful number, since it uses less digits than its factorization.

857040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587 (or 3581 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 857040 is about 925.7645489000. The cubic root of 857040 is about 94.9876253503.

Adding to 857040 its reverse (40758), we get a palindrome (897798).

The spelling of 857040 in words is "eight hundred fifty-seven thousand, forty".