842520 has 128 divisors (see below), whose sum is σ = 3110400. Its totient is φ = 178176.

The previous prime is 842519. The next prime is 842521. The reversal of 842520 is 25248.

842520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (842519) and next prime (842521).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14251 + ... + 14309.

It is an arithmetic number, because the mean of its divisors is an integer number (24300).

2⁸⁴²⁵²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555200).

842520 is an abundant number, since it is smaller than the sum of its proper divisors (2267880).

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

842520 is a wasteful number, since it uses less digits than its factorization.

842520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 842520 is about 917.8888821638. Note that the first 5 decimals coincide. The cubic root of 842520 is about 94.4481392890.

Adding to 842520 its reverse (25248), we get a palindrome (867768).

The spelling of 842520 in words is "eight hundred forty-two thousand, five hundred twenty".