987993 has 12 divisors (see below), whose sum is σ = 1438528. Its totient is φ = 653400.

The previous prime is 987991. The next prime is 987997. The reversal of 987993 is 399789.

It is a happy number.

It is not a de Polignac number, because 987993 - 2¹ = 987991 is a prime.

It is a super-2 number, since 2×987993² = 1952260336098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987991) 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, 996 + ... + 1722.

2⁹⁸⁷⁹⁹³ is an apocalyptic number.

It is an amenable number.

987993 is a deficient number, since it is larger than the sum of its proper divisors (450535).

987993 is a wasteful number, since it uses less digits than its factorization.

987993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 881 counting only the distinct ones).

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

The square root of 987993 is about 993.9783699860. The cubic root of 987993 is about 99.5981540278.

The spelling of 987993 in words is "nine hundred eighty-seven thousand, nine hundred ninety-three".