8719921 has 16 divisors (see below), whose sum is σ = 10660608. Its totient is φ = 6969600.

The previous prime is 8719903. The next prime is 8719939. The reversal of 8719921 is 1299178.

It is an interprime number because it is at equal distance from previous prime (8719903) and next prime (8719939).

It is a 2-Lehmer number, since φ(8719921) divides (8719921-1)².

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 8719921 - 2¹¹ = 8717873 is a prime.

It is a deceptive number, since it divides R_8719920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8719951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5941 + ... + 7261.

It is an arithmetic number, because the mean of its divisors is an integer number (666288).

It is a Poulet number, since it divides 2^8719920-1.

Almost surely, 2^8719921 is an apocalyptic number.

It is an amenable number.

8719921 is a deficient number, since it is larger than the sum of its proper divisors (1940687).

8719921 is a wasteful number, since it uses less digits than its factorization.

8719921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392.

The product of its digits is 9072, while the sum is 37.

The square root of 8719921 is about 2952.9512356285. The cubic root of 8719921 is about 205.8278717356.

The spelling of 8719921 in words is "eight million, seven hundred nineteen thousand, nine hundred twenty-one".