851040 has 96 divisors (see below), whose sum is σ = 2993760. Its totient is φ = 225792.

The previous prime is 851033. The next prime is 851041. The reversal of 851040 is 40158.

851040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a zygodrome in base 2.

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 851040.

It is not an unprimeable number, because it can be changed into a prime (851041) by changing a digit.

851040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4222 + ... + 4418.

It is an arithmetic number, because the mean of its divisors is an integer number (31185).

2⁸⁵¹⁰⁴⁰ is an apocalyptic number.

851040 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 851040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1496880).

851040 is an abundant number, since it is smaller than the sum of its proper divisors (2142720).

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

851040 is a wasteful number, since it uses less digits than its factorization.

851040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 851040 is about 922.5182925016. The cubic root of 851040 is about 94.7654416578.

Adding to 851040 its reverse (40158), we get a palindrome (891198).

The spelling of 851040 in words is "eight hundred fifty-one thousand, forty".