6440935 has 4 divisors (see below), whose sum is σ = 7729128. Its totient is φ = 5152744.

The previous prime is 6440933. The next prime is 6440939. The reversal of 6440935 is 5390446.

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 6440935 - 2¹ = 6440933 is a prime.

It is a Duffinian number.

6440935 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6440897 and 6440906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644089 + ... + 644098.

It is an arithmetic number, because the mean of its divisors is an integer number (1932282).

Almost surely, 2^6440935 is an apocalyptic number.

6440935 is a deficient number, since it is larger than the sum of its proper divisors (1288193).

6440935 is a wasteful number, since it uses less digits than its factorization.

6440935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288192.

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

The square root of 6440935 is about 2537.8997222113. The cubic root of 6440935 is about 186.0585528840.

The spelling of 6440935 in words is "six million, four hundred forty thousand, nine hundred thirty-five".