9877891 has 4 divisors (see below), whose sum is σ = 10397800. Its totient is φ = 9357984.

The previous prime is 9877859. The next prime is 9877897. The reversal of 9877891 is 1987789.

9877891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9877891 - 2⁵ = 9877859 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9877897) 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, 259926 + ... + 259963.

It is an arithmetic number, because the mean of its divisors is an integer number (2599450).

Almost surely, 2^9877891 is an apocalyptic number.

9877891 is a deficient number, since it is larger than the sum of its proper divisors (519909).

9877891 is a wasteful number, since it uses less digits than its factorization.

9877891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519908.

The product of its digits is 254016, while the sum is 49.

The square root of 9877891 is about 3142.9112300541. The cubic root of 9877891 is about 214.5629557130.

The spelling of 9877891 in words is "nine million, eight hundred seventy-seven thousand, eight hundred ninety-one".