6440853 has 8 divisors (see below), whose sum is σ = 8733600. Its totient is φ = 4221008.

The previous prime is 6440831. The next prime is 6440873. The reversal of 6440853 is 3580446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440853 - 2⁵ = 6440821 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18018 + ... + 18371.

It is an arithmetic number, because the mean of its divisors is an integer number (1091700).

Almost surely, 2^6440853 is an apocalyptic number.

It is an amenable number.

6440853 is a deficient number, since it is larger than the sum of its proper divisors (2292747).

6440853 is a wasteful number, since it uses less digits than its factorization.

6440853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36451.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6440853 is about 2537.8835670692. The cubic root of 6440853 is about 186.0577633058.

The spelling of 6440853 in words is "six million, four hundred forty thousand, eight hundred fifty-three".