6440898 has 16 divisors (see below), whose sum is σ = 12941280. Its totient is φ = 2137056.

The previous prime is 6440893. The next prime is 6440933. The reversal of 6440898 is 8980446.

It is not an unprimeable number, because it can be changed into a prime (6440891) 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, 1003 + ... + 3726.

It is an arithmetic number, because the mean of its divisors is an integer number (808830).

Almost surely, 2^6440898 is an apocalyptic number.

6440898 is an abundant number, since it is smaller than the sum of its proper divisors (6500382).

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

6440898 is a wasteful number, since it uses less digits than its factorization.

6440898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 6440898 is about 2537.8924327087. The cubic root of 6440898 is about 186.0581966118.

The spelling of 6440898 in words is "six million, four hundred forty thousand, eight hundred ninety-eight".