6399472 has 20 divisors (see below), whose sum is σ = 12571120. Its totient is φ = 3155328.

The previous prime is 6399467. The next prime is 6399509. The reversal of 6399472 is 2749936.

It is a d-powerful number, because it can be written as 6² + 3¹³ + 9³ + 9⁷ + 4⁶ + 7⁵ + 2⁹ .

It is a congruent number.

It is an unprimeable number.

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, 1572 + ... + 3907.

It is an arithmetic number, because the mean of its divisors is an integer number (628556).

Almost surely, 2^6399472 is an apocalyptic number.

It is an amenable number.

6399472 is a deficient number, since it is larger than the sum of its proper divisors (6171648).

6399472 is a wasteful number, since it uses less digits than its factorization.

6399472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560 (or 5554 counting only the distinct ones).

The product of its digits is 81648, while the sum is 40.

The square root of 6399472 is about 2529.7177708195. The cubic root of 6399472 is about 185.6584474564.

The spelling of 6399472 in words is "six million, three hundred ninety-nine thousand, four hundred seventy-two".