6499855 has 16 divisors (see below), whose sum is σ = 8044128. Its totient is φ = 5040000.

The previous prime is 6499841. The next prime is 6499859. The reversal of 6499855 is 5589946.

It is not a de Polignac number, because 6499855 - 2¹¹ = 6497807 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6499859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30700 + ... + 30910.

It is an arithmetic number, because the mean of its divisors is an integer number (502758).

Almost surely, 2^6499855 is an apocalyptic number.

6499855 is a deficient number, since it is larger than the sum of its proper divisors (1544273).

6499855 is a wasteful number, since it uses less digits than its factorization.

6499855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 388800, while the sum is 46.

The square root of 6499855 is about 2549.4813197982. The cubic root of 6499855 is about 186.6241701020.

Subtracting from 6499855 its reverse (5589946), we obtain a palindrome (909909).

The spelling of 6499855 in words is "six million, four hundred ninety-nine thousand, eight hundred fifty-five".