6390491 has 4 divisors (see below), whose sum is σ = 6418152. Its totient is φ = 6362832.

The previous prime is 6390463. The next prime is 6390499. The reversal of 6390491 is 1940936.

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

It is a cyclic number.

It is not a de Polignac number, because 6390491 - 2⁶ = 6390427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6390499) 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 3 ways as a sum of consecutive naturals, for example, 13481 + ... + 13946.

It is an arithmetic number, because the mean of its divisors is an integer number (1604538).

Almost surely, 2^6390491 is an apocalyptic number.

6390491 is a deficient number, since it is larger than the sum of its proper divisors (27661).

6390491 is a wasteful number, since it uses less digits than its factorization.

6390491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27660.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 6390491 is about 2527.9420483864. The cubic root of 6390491 is about 185.5715559580.

The spelling of 6390491 in words is "six million, three hundred ninety thousand, four hundred ninety-one".