9877987 has 4 divisors (see below), whose sum is σ = 11289136. Its totient is φ = 8466840.

The previous prime is 9877961. The next prime is 9877997. The reversal of 9877987 is 7897789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7897789 = 41 ⋅192629.

It is a cyclic number.

It is not a de Polignac number, because 9877987 - 2⁷ = 9877859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9877937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705564 + ... + 705577.

It is an arithmetic number, because the mean of its divisors is an integer number (2822284).

Almost surely, 2^9877987 is an apocalyptic number.

9877987 is a deficient number, since it is larger than the sum of its proper divisors (1411149).

9877987 is a wasteful number, since it uses less digits than its factorization.

9877987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411148.

The product of its digits is 1778112, while the sum is 55.

The square root of 9877987 is about 3142.9265024814. The cubic root of 9877987 is about 214.5636507999.

The spelling of 9877987 in words is "nine million, eight hundred seventy-seven thousand, nine hundred eighty-seven".