617987 has 8 divisors (see below), whose sum is σ = 653856. Its totient is φ = 582912.

The previous prime is 617983. The next prime is 618029. The reversal of 617987 is 789716.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 617987 - 2² = 617983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 617987.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 617987.

It is not an unprimeable number, because it can be changed into a prime (617983) 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, 2093 + ... + 2369.

It is an arithmetic number, because the mean of its divisors is an integer number (81732).

2⁶¹⁷⁹⁸⁷ is an apocalyptic number.

617987 is a deficient number, since it is larger than the sum of its proper divisors (35869).

617987 is a wasteful number, since it uses less digits than its factorization.

617987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397.

The product of its digits is 21168, while the sum is 38.

The square root of 617987 is about 786.1214918828. The cubic root of 617987 is about 85.1778054262.

The spelling of 617987 in words is "six hundred seventeen thousand, nine hundred eighty-seven".