6438121 has 4 divisors (see below), whose sum is σ = 6816852. Its totient is φ = 6059392.

The previous prime is 6438109. The next prime is 6438143. The reversal of 6438121 is 1218346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1218346 = 2 ⋅609173.

It can be written as a sum of positive squares in 2 ways, for example, as 4247721 + 2190400 = 2061^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 6438121 - 2¹⁵ = 6405353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6438101) 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, 189340 + ... + 189373.

It is an arithmetic number, because the mean of its divisors is an integer number (1704213).

Almost surely, 2^6438121 is an apocalyptic number.

It is an amenable number.

6438121 is a deficient number, since it is larger than the sum of its proper divisors (378731).

6438121 is a wasteful number, since it uses less digits than its factorization.

6438121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378730.

The product of its digits is 1152, while the sum is 25.

The square root of 6438121 is about 2537.3452662182. The cubic root of 6438121 is about 186.0314530383.

The spelling of 6438121 in words is "six million, four hundred thirty-eight thousand, one hundred twenty-one".