6398890 has 16 divisors (see below), whose sum is σ = 11547360. Its totient is φ = 2553040.

The previous prime is 6398881. The next prime is 6398897. The reversal of 6398890 is 988936.

It is not an unprimeable number, because it can be changed into a prime (6398897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6105 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (721710).

Almost surely, 2^6398890 is an apocalyptic number.

6398890 is a deficient number, since it is larger than the sum of its proper divisors (5148470).

6398890 is a wasteful number, since it uses less digits than its factorization.

6398890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 6398890 is about 2529.6027356089. The cubic root of 6398890 is about 185.6528190497.

The spelling of 6398890 in words is "six million, three hundred ninety-eight thousand, eight hundred ninety".