6421418 has 4 divisors (see below), whose sum is σ = 9632130. Its totient is φ = 3210708.

The previous prime is 6421417. The next prime is 6421421. The reversal of 6421418 is 8141246.

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

It can be written as a sum of positive squares in only one way, i.e., 6416089 + 5329 = 2533^2 + 73^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6421417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605353 + ... + 1605356.

Almost surely, 2^6421418 is an apocalyptic number.

6421418 is a deficient number, since it is larger than the sum of its proper divisors (3210712).

6421418 is a wasteful number, since it uses less digits than its factorization.

6421418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210711.

The product of its digits is 1536, while the sum is 26.

The square root of 6421418 is about 2534.0516963945. The cubic root of 6421418 is about 185.8704342976.

The spelling of 6421418 in words is "six million, four hundred twenty-one thousand, four hundred eighteen".