6388491 has 4 divisors (see below), whose sum is σ = 8517992. Its totient is φ = 4258992.

The previous prime is 6388483. The next prime is 6388507. The reversal of 6388491 is 1948836.

6388491 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6388491 - 2³ = 6388483 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6388441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064746 + ... + 1064751.

It is an arithmetic number, because the mean of its divisors is an integer number (2129498).

Almost surely, 2^6388491 is an apocalyptic number.

6388491 is a deficient number, since it is larger than the sum of its proper divisors (2129501).

6388491 is a wasteful number, since it uses less digits than its factorization.

6388491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129500.

The product of its digits is 41472, while the sum is 39.

The square root of 6388491 is about 2527.5464387425. The cubic root of 6388491 is about 185.5521948042.

The spelling of 6388491 in words is "six million, three hundred eighty-eight thousand, four hundred ninety-one".