731987 has 4 divisors (see below), whose sum is σ = 738936. Its totient is φ = 725040.

The previous prime is 731981. The next prime is 731999. The reversal of 731987 is 789137.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 731987 - 2⁶ = 731923 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 731987.

It is not an unprimeable number, because it can be changed into a prime (731981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3314 + ... + 3527.

It is an arithmetic number, because the mean of its divisors is an integer number (184734).

2⁷³¹⁹⁸⁷ is an apocalyptic number.

731987 is a deficient number, since it is larger than the sum of its proper divisors (6949).

731987 is a wasteful number, since it uses less digits than its factorization.

731987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948.

The product of its digits is 10584, while the sum is 35.

The square root of 731987 is about 855.5623881401. The cubic root of 731987 is about 90.1227543055.

The spelling of 731987 in words is "seven hundred thirty-one thousand, nine hundred eighty-seven".