6489445399 has 4 divisors (see below), whose sum is σ = 6489735336. Its totient is φ = 6489155464.

The previous prime is 6489445337. The next prime is 6489445409. The reversal of 6489445399 is 9935449846.

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 6489445399 - 2⁷ = 6489445271 is a prime.

It is a super-2 number, since 2×6489445399² = 84225803173204538402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6489445499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108304 + ... + 157189.

It is an arithmetic number, because the mean of its divisors is an integer number (1622433834).

Almost surely, 2^6489445399 is an apocalyptic number.

6489445399 is a deficient number, since it is larger than the sum of its proper divisors (289937).

6489445399 is a wasteful number, since it uses less digits than its factorization.

6489445399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289936.

The product of its digits is 33592320, while the sum is 61.

The square root of 6489445399 is about 80557.0940327418. The cubic root of 6489445399 is about 1865.2448987077.

The spelling of 6489445399 in words is "six billion, four hundred eighty-nine million, four hundred forty-five thousand, three hundred ninety-nine".