8878921 has 2 divisors, whose sum is σ = 8878922. Its totient is φ = 8878920.

The previous prime is 8878873. The next prime is 8878949. The reversal of 8878921 is 1298788.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6056521 + 2822400 = 2461^2 + 1680^2 .

It is a cyclic number.

It is not a de Polignac number, because 8878921 - 2²³ = 490313 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8878421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4439460 + 4439461.

It is an arithmetic number, because the mean of its divisors is an integer number (4439461).

Almost surely, 2^8878921 is an apocalyptic number.

It is an amenable number.

8878921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8878921 is an equidigital number, since it uses as much as digits as its factorization.

8878921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The square root of 8878921 is about 2979.7518353044. The cubic root of 8878921 is about 207.0713733978.

The spelling of 8878921 in words is "eight million, eight hundred seventy-eight thousand, nine hundred twenty-one".