9877421 has 2 divisors, whose sum is σ = 9877422. Its totient is φ = 9877420.

The previous prime is 9877393. The next prime is 9877423. The reversal of 9877421 is 1247789.

9877421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 354025 = 3086^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9877421 is a prime.

It is a super-2 number, since 2×9877421² = 195126891222482, which contains 22 as substring.

Together with 9877423, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9877423) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4938710 + 4938711.

It is an arithmetic number, because the mean of its divisors is an integer number (4938711).

Almost surely, 2^9877421 is an apocalyptic number.

It is an amenable number.

9877421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9877421 is an equidigital number, since it uses as much as digits as its factorization.

9877421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 9877421 is about 3142.8364577241. The cubic root of 9877421 is about 214.5595526186.

The spelling of 9877421 in words is "nine million, eight hundred seventy-seven thousand, four hundred twenty-one".