6438939049 has 9 divisors (see below), whose sum is σ = 6671038647. Its totient is φ = 6214659864.

The previous prime is 6438939043. The next prime is 6438939061. The reversal of 6438939049 is 9409398346.

The square root of 6438939049 is 80243.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3376423449 + 3062515600 = 58107^2 + 55340^2 .

It is not a de Polignac number, because 6438939049 - 2⁹ = 6438938537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6438939043) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2325664 + ... + 2328430.

Almost surely, 2^6438939049 is an apocalyptic number.

6438939049 is the 80243-rd square number.

6438939049 is the 40122-nd centered octagonal number.

It is an amenable number.

6438939049 is a deficient number, since it is larger than the sum of its proper divisors (232099598).

6438939049 is an frugal number, since it uses more digits than its factorization.

6438939049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 55.

The cubic root of 6438939049 is about 1860.3933196238.

The spelling of 6438939049 in words is "six billion, four hundred thirty-eight million, nine hundred thirty-nine thousand, forty-nine".