987992 has 8 divisors (see below), whose sum is σ = 1852500. Its totient is φ = 493992.

The previous prime is 987991. The next prime is 987997. The reversal of 987992 is 299789.

987992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×987992² = 1952256384128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61742 + ... + 61757.

2⁹⁸⁷⁹⁹² is an apocalyptic number.

It is an amenable number.

987992 is a deficient number, since it is larger than the sum of its proper divisors (864508).

987992 is a wasteful number, since it uses less digits than its factorization.

987992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123505 (or 123501 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 987992 is about 993.9778669568. The cubic root of 987992 is about 99.5981204250.

Adding to 987992 its sum of digits (44), we get a square (988036 = 994²).

The spelling of 987992 in words is "nine hundred eighty-seven thousand, nine hundred ninety-two".