8518421 has 4 divisors (see below), whose sum is σ = 8699712. Its totient is φ = 8337132.

The previous prime is 8518417. The next prime is 8518427. The reversal of 8518421 is 1248158.

8518421 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8518421 - 2² = 8518417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8518427) 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, 90575 + ... + 90668.

It is an arithmetic number, because the mean of its divisors is an integer number (2174928).

Almost surely, 2^8518421 is an apocalyptic number.

It is an amenable number.

8518421 is a deficient number, since it is larger than the sum of its proper divisors (181291).

8518421 is a wasteful number, since it uses less digits than its factorization.

8518421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181290.

The product of its digits is 2560, while the sum is 29.

The square root of 8518421 is about 2918.6334130891. The cubic root of 8518421 is about 204.2300765049.

The spelling of 8518421 in words is "eight million, five hundred eighteen thousand, four hundred twenty-one".