9987943 has 8 divisors (see below), whose sum is σ = 11475488. Its totient is φ = 8515584.

The previous prime is 9987941. The next prime is 9987949. The reversal of 9987943 is 3497899.

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

It is not a de Polignac number, because 9987943 - 2¹ = 9987941 is a prime.

It is a d-powerful number, because it can be written as 9² + 9² + 8⁷ + 7⁸ + 9⁶ + 4³ + 3¹³ .

It is a Duffinian number.

9987943 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2346 + ... + 5047.

It is an arithmetic number, because the mean of its divisors is an integer number (1434436).

Almost surely, 2^9987943 is an apocalyptic number.

9987943 is a deficient number, since it is larger than the sum of its proper divisors (1487545).

9987943 is a wasteful number, since it uses less digits than its factorization.

9987943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7593.

The product of its digits is 489888, while the sum is 49.

The square root of 9987943 is about 3160.3707061040. The cubic root of 9987943 is about 215.3568474505.

The spelling of 9987943 in words is "nine million, nine hundred eighty-seven thousand, nine hundred forty-three".