851520 has 56 divisors (see below), whose sum is σ = 2706624. Its totient is φ = 226816.

The previous prime is 851519. The next prime is 851537. The reversal of 851520 is 25158.

851520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517 + ... + 1403.

2⁸⁵¹⁵²⁰ is an apocalyptic number.

851520 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 851520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1353312).

851520 is an abundant number, since it is smaller than the sum of its proper divisors (1855104).

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

851520 is a wasteful number, since it uses less digits than its factorization.

851520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 851520 is about 922.7784132716. The cubic root of 851520 is about 94.7832547111.

Adding to 851520 its reverse (25158), we get a palindrome (876678).

The spelling of 851520 in words is "eight hundred fifty-one thousand, five hundred twenty".