987820 has 12 divisors (see below), whose sum is σ = 2074464. Its totient is φ = 395120.

The previous prime is 987809. The next prime is 987821. The reversal of 987820 is 28789.

It is a happy number.

987820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (987821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24676 + ... + 24715.

It is an arithmetic number, because the mean of its divisors is an integer number (172872).

2⁹⁸⁷⁸²⁰ is an apocalyptic number.

It is an amenable number.

987820 is an abundant number, since it is smaller than the sum of its proper divisors (1086644).

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

987820 is a wasteful number, since it uses less digits than its factorization.

987820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49400 (or 49398 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 987820 is about 993.8913421496. The cubic root of 987820 is about 99.5923403947.

The spelling of 987820 in words is "nine hundred eighty-seven thousand, eight hundred twenty".