6421998 has 16 divisors (see below), whose sum is σ = 14011776. Its totient is φ = 1946040.

The previous prime is 6421997. The next prime is 6422011. The reversal of 6421998 is 8991246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48586 + ... + 48717.

It is an arithmetic number, because the mean of its divisors is an integer number (875736).

Almost surely, 2^6421998 is an apocalyptic number.

6421998 is an abundant number, since it is smaller than the sum of its proper divisors (7589778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6421998 is a wasteful number, since it uses less digits than its factorization.

6421998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97319.

The product of its digits is 31104, while the sum is 39.

The square root of 6421998 is about 2534.1661350432. The cubic root of 6421998 is about 185.8760302374.

The spelling of 6421998 in words is "six million, four hundred twenty-one thousand, nine hundred ninety-eight".