6421138 has 8 divisors (see below), whose sum is σ = 10198332. Its totient is φ = 3021696.

The previous prime is 6421127. The next prime is 6421139. The reversal of 6421138 is 8311246.

It can be written as a sum of positive squares in 2 ways, for example, as 6335289 + 85849 = 2517^2 + 293^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6421139) 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, 94395 + ... + 94462.

Almost surely, 2^6421138 is an apocalyptic number.

6421138 is a deficient number, since it is larger than the sum of its proper divisors (3777194).

6421138 is a wasteful number, since it uses less digits than its factorization.

6421138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188876.

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

The square root of 6421138 is about 2533.9964483006. The cubic root of 6421138 is about 185.8677326888.

The spelling of 6421138 in words is "six million, four hundred twenty-one thousand, one hundred thirty-eight".