993987 has 12 divisors (see below), whose sum is σ = 1446120. Its totient is φ = 657888.

The previous prime is 993983. The next prime is 993997. The reversal of 993987 is 789399.

It is a happy number.

It is not a de Polignac number, because 993987 - 2² = 993983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (993983) 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 11 ways as a sum of consecutive naturals, for example, 1303 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (120510).

2⁹⁹³⁹⁸⁷ is an apocalyptic number.

993987 is a deficient number, since it is larger than the sum of its proper divisors (452133).

993987 is a wasteful number, since it uses less digits than its factorization.

993987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 799 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 993987 is about 996.9889668397. The cubic root of 993987 is about 99.7991635840.

The spelling of 993987 in words is "nine hundred ninety-three thousand, nine hundred eighty-seven".