987947 has 4 divisors (see below), whose sum is σ = 990360. Its totient is φ = 985536.

The previous prime is 987941. The next prime is 987971. The reversal of 987947 is 749789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749789 = 79 ⋅9491.

It is a cyclic number.

It is not a de Polignac number, because 987947 - 2¹⁴ = 971563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 987898 and 987907.

It is not an unprimeable number, because it can be changed into a prime (987941) 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 3 ways as a sum of consecutive naturals, for example, 422 + ... + 1467.

It is an arithmetic number, because the mean of its divisors is an integer number (247590).

2⁹⁸⁷⁹⁴⁷ is an apocalyptic number.

987947 is a deficient number, since it is larger than the sum of its proper divisors (2413).

987947 is a wasteful number, since it uses less digits than its factorization.

987947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412.

The product of its digits is 127008, while the sum is 44.

The square root of 987947 is about 993.9552303801. The cubic root of 987947 is about 99.5966082725.

The spelling of 987947 in words is "nine hundred eighty-seven thousand, nine hundred forty-seven".