6440455 has 8 divisors (see below), whose sum is σ = 8832672. Its totient is φ = 4416288.

The previous prime is 6440453. The next prime is 6440459. The reversal of 6440455 is 5540446.

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 6440455 - 2¹ = 6440453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91972 + ... + 92041.

It is an arithmetic number, because the mean of its divisors is an integer number (1104084).

Almost surely, 2^6440455 is an apocalyptic number.

6440455 is a deficient number, since it is larger than the sum of its proper divisors (2392217).

6440455 is a wasteful number, since it uses less digits than its factorization.

6440455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184025.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 6440455 is about 2537.8051540652. The cubic root of 6440455 is about 186.0539308675.

Subtracting from 6440455 its reverse (5540446), we obtain a palindrome (900009).

The spelling of 6440455 in words is "six million, four hundred forty thousand, four hundred fifty-five".