987729 has 4 divisors (see below), whose sum is σ = 1316976. Its totient is φ = 658484.

The previous prime is 987713. The next prime is 987739. The reversal of 987729 is 927789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 987729 - 2⁴ = 987713 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (987739) 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, 164619 + ... + 164624.

It is an arithmetic number, because the mean of its divisors is an integer number (329244).

2⁹⁸⁷⁷²⁹ is an apocalyptic number.

It is an amenable number.

987729 is a deficient number, since it is larger than the sum of its proper divisors (329247).

987729 is a wasteful number, since it uses less digits than its factorization.

987729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329246.

The product of its digits is 63504, while the sum is 42.

The square root of 987729 is about 993.8455614430. The cubic root of 987729 is about 99.5892820841.

The spelling of 987729 in words is "nine hundred eighty-seven thousand, seven hundred twenty-nine".