8427121 has 4 divisors (see below), whose sum is σ = 8922852. Its totient is φ = 7931392.

The previous prime is 8427113. The next prime is 8427161. The reversal of 8427121 is 1217248.

It is a happy number.

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 4682896 + 3744225 = 2164^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 8427121 - 2³ = 8427113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8427161) 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, 247840 + ... + 247873.

It is an arithmetic number, because the mean of its divisors is an integer number (2230713).

Almost surely, 2^8427121 is an apocalyptic number.

It is an amenable number.

8427121 is a deficient number, since it is larger than the sum of its proper divisors (495731).

8427121 is a wasteful number, since it uses less digits than its factorization.

8427121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495730.

The product of its digits is 896, while the sum is 25.

The square root of 8427121 is about 2902.9503957181. The cubic root of 8427121 is about 203.4978116143.

The spelling of 8427121 in words is "eight million, four hundred twenty-seven thousand, one hundred twenty-one".