6421738 has 16 divisors (see below), whose sum is σ = 10134720. Its totient is φ = 3045856.

The previous prime is 6421729. The next prime is 6421739. The reversal of 6421738 is 8371246.

It is not an unprimeable number, because it can be changed into a prime (6421739) 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, 5793 + ... + 6811.

It is an arithmetic number, because the mean of its divisors is an integer number (633420).

Almost surely, 2^6421738 is an apocalyptic number.

6421738 is a deficient number, since it is larger than the sum of its proper divisors (3712982).

6421738 is a wasteful number, since it uses less digits than its factorization.

6421738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181.

The product of its digits is 8064, while the sum is 31.

The square root of 6421738 is about 2534.1148355984. The cubic root of 6421738 is about 185.8735217543.

The spelling of 6421738 in words is "six million, four hundred twenty-one thousand, seven hundred thirty-eight".