8727921 has 12 divisors (see below), whose sum is σ = 12684672. Its totient is φ = 5782776.

The previous prime is 8727913. The next prime is 8727931. The reversal of 8727921 is 1297278.

It is not a de Polignac number, because 8727921 - 2³ = 8727913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8727931) 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 11 ways as a sum of consecutive naturals, for example, 1401 + ... + 4406.

It is an arithmetic number, because the mean of its divisors is an integer number (1057056).

Almost surely, 2^8727921 is an apocalyptic number.

It is an amenable number.

8727921 is a deficient number, since it is larger than the sum of its proper divisors (3956751).

8727921 is a wasteful number, since it uses less digits than its factorization.

8727921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5980 (or 5977 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 8727921 is about 2954.3055021443. The cubic root of 8727921 is about 205.8907973695.

The spelling of 8727921 in words is "eight million, seven hundred twenty-seven thousand, nine hundred twenty-one".