8421877 has 2 divisors, whose sum is σ = 8421878. Its totient is φ = 8421876.

The previous prime is 8421857. The next prime is 8421901. The reversal of 8421877 is 7781248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7257636 + 1164241 = 2694^2 + 1079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8421877 is a prime.

8421877 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210938 + 4210939.

It is an arithmetic number, because the mean of its divisors is an integer number (4210939).

Almost surely, 2^8421877 is an apocalyptic number.

It is an amenable number.

8421877 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421877 is an equidigital number, since it uses as much as digits as its factorization.

8421877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 8421877 is about 2902.0470361453. The cubic root of 8421877 is about 203.4555922153.

The spelling of 8421877 in words is "eight million, four hundred twenty-one thousand, eight hundred seventy-seven".