987156 has 36 divisors (see below), whose sum is σ = 2643732. Its totient is φ = 309504.

The previous prime is 987143. The next prime is 987191. The reversal of 987156 is 651789.

It can be written as a sum of positive squares in 2 ways, for example, as 695556 + 291600 = 834^2 + 540^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 987156.

It is a congruent number.

It is an unprimeable number.

987156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (73437).

2⁹⁸⁷¹⁵⁶ 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 987156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1321866).

987156 is an abundant number, since it is smaller than the sum of its proper divisors (1656576).

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

987156 is a wasteful number, since it uses less digits than its factorization.

987156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640 (or 1635 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 987156 is about 993.5572454569. The cubic root of 987156 is about 99.5700204928.

The spelling of 987156 in words is "nine hundred eighty-seven thousand, one hundred fifty-six".