287992 has 8 divisors (see below), whose sum is σ = 540000. Its totient is φ = 143992.

The previous prime is 287977. The next prime is 288007. The reversal of 287992 is 299782.

It is an interprime number because it is at equal distance from previous prime (287977) and next prime (288007).

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

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17992 + ... + 18007.

It is an arithmetic number, because the mean of its divisors is an integer number (67500).

2²⁸⁷⁹⁹² is an apocalyptic number.

It is an amenable number.

287992 is a deficient number, since it is larger than the sum of its proper divisors (252008).

287992 is a wasteful number, since it uses less digits than its factorization.

287992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36005 (or 36001 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 287992 is about 536.6488609883. The cubic root of 287992 is about 66.0379335042.

The spelling of 287992 in words is "two hundred eighty-seven thousand, nine hundred ninety-two".