6439225 has 12 divisors (see below), whose sum is σ = 8599276. Its totient is φ = 4754880.

The previous prime is 6439219. The next prime is 6439259. The reversal of 6439225 is 5229346.

It can be written as a sum of positive squares in 6 ways, for example, as 2702736 + 3736489 = 1644^2 + 1933^2 .

It is not a de Polignac number, because 6439225 - 2³ = 6439217 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 6³ + 4¹¹ + 3⁷ + 9⁵ + 2¹³ + 2²¹ + 5⁷ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9582 + ... + 10231.

Almost surely, 2^6439225 is an apocalyptic number.

6439225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6439225 is a deficient number, since it is larger than the sum of its proper divisors (2160051).

6439225 is a wasteful number, since it uses less digits than its factorization.

6439225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19836 (or 19831 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 6439225 is about 2537.5628071045. The cubic root of 6439225 is about 186.0420859019.

The spelling of 6439225 in words is "six million, four hundred thirty-nine thousand, two hundred twenty-five".