987917 has 4 divisors (see below), whose sum is σ = 1129056. Its totient is φ = 846780.

The previous prime is 987913. The next prime is 987929. The reversal of 987917 is 719789.

987917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 987917 - 2² = 987913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 987917.

It is not an unprimeable number, because it can be changed into a prime (987911) 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, 70559 + ... + 70572.

It is an arithmetic number, because the mean of its divisors is an integer number (282264).

2⁹⁸⁷⁹¹⁷ is an apocalyptic number.

It is an amenable number.

987917 is a deficient number, since it is larger than the sum of its proper divisors (141139).

987917 is a wasteful number, since it uses less digits than its factorization.

987917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141138.

The product of its digits is 31752, while the sum is 41.

The square root of 987917 is about 993.9401390426. The cubic root of 987917 is about 99.5956001454.

The spelling of 987917 in words is "nine hundred eighty-seven thousand, nine hundred seventeen".