8871421 has 4 divisors (see below), whose sum is σ = 9553852. Its totient is φ = 8188992.

The previous prime is 8871409. The next prime is 8871427. The reversal of 8871421 is 1241788.

8871421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2292196 + 6579225 = 1514^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 8871421 - 2⁵ = 8871389 is a prime.

It is a super-2 number, since 2×8871421² = 157404221118482, which contains 22 as substring.

It is a Duffinian number.

8871421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8871427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341196 + ... + 341221.

It is an arithmetic number, because the mean of its divisors is an integer number (2388463).

Almost surely, 2^8871421 is an apocalyptic number.

It is an amenable number.

8871421 is a deficient number, since it is larger than the sum of its proper divisors (682431).

8871421 is a wasteful number, since it uses less digits than its factorization.

8871421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682430.

The product of its digits is 3584, while the sum is 31.

The square root of 8871421 is about 2978.4930753655. The cubic root of 8871421 is about 207.0130527682.

The spelling of 8871421 in words is "eight million, eight hundred seventy-one thousand, four hundred twenty-one".