6390646 has 4 divisors (see below), whose sum is σ = 9585972. Its totient is φ = 3195322.

The previous prime is 6390641. The next prime is 6390653. The reversal of 6390646 is 6460936.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390641) 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 as a sum of consecutive naturals, namely, 1597660 + ... + 1597663.

It is an arithmetic number, because the mean of its divisors is an integer number (2396493).

Almost surely, 2^6390646 is an apocalyptic number.

6390646 is a deficient number, since it is larger than the sum of its proper divisors (3195326).

6390646 is a wasteful number, since it uses less digits than its factorization.

6390646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195325.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 6390646 is about 2527.9727055489. The cubic root of 6390646 is about 185.5730562787.

It can be divided in two parts, 63 and 90646, that added together give a palindrome (90709).

The spelling of 6390646 in words is "six million, three hundred ninety thousand, six hundred forty-six".