987220 has 24 divisors (see below), whose sum is σ = 2233224. Its totient is φ = 364416.

The previous prime is 987211. The next prime is 987227. The reversal of 987220 is 22789.

It can be written as a sum of positive squares in 4 ways, for example, as 42436 + 944784 = 206^2 + 972^2 .

It is a plaindrome in base 15.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (93051).

2⁹⁸⁷²²⁰ is an apocalyptic number.

It is an amenable number.

987220 is an abundant number, since it is smaller than the sum of its proper divisors (1246004).

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

987220 is a wasteful number, since it uses less digits than its factorization.

987220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819 (or 3817 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 987220 is about 993.5894524400. The cubic root of 987220 is about 99.5721722444.

The spelling of 987220 in words is "nine hundred eighty-seven thousand, two hundred twenty".