842780 has 12 divisors (see below), whose sum is σ = 1769880. Its totient is φ = 337104.

The previous prime is 842771. The next prime is 842791. The reversal of 842780 is 87248.

842780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21050 + ... + 21089.

It is an arithmetic number, because the mean of its divisors is an integer number (147490).

2⁸⁴²⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

842780 is an abundant number, since it is smaller than the sum of its proper divisors (927100).

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

842780 is a wasteful number, since it uses less digits than its factorization.

842780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42148 (or 42146 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 842780 is about 918.0305005826. The cubic root of 842780 is about 94.4578537926.

The spelling of 842780 in words is "eight hundred forty-two thousand, seven hundred eighty".