987129 has 36 divisors (see below), whose sum is σ = 1712880. Its totient is φ = 542880.

The previous prime is 987127. The next prime is 987143. The reversal of 987129 is 921789.

It is a happy number.

It is not a de Polignac number, because 987129 - 2¹ = 987127 is a prime.

987129 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 987093 and 987102.

It is not an unprimeable number, because it can be changed into a prime (987127) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16702 + ... + 16760.

It is an arithmetic number, because the mean of its divisors is an integer number (47580).

2⁹⁸⁷¹²⁹ is an apocalyptic number.

987129 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

987129 is a deficient number, since it is larger than the sum of its proper divisors (725751).

987129 is a wasteful number, since it uses less digits than its factorization.

987129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 86 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 987129 is about 993.5436578228. The cubic root of 987129 is about 99.5691126946.

It can be divided in two parts, 98 and 7129, that added together give a palindrome (7227).

The spelling of 987129 in words is "nine hundred eighty-seven thousand, one hundred twenty-nine".