6444455 has 4 divisors (see below), whose sum is σ = 7733352. Its totient is φ = 5155560.

The previous prime is 6444443. The next prime is 6444481. The reversal of 6444455 is 5544446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6444455 - 2⁶ = 6444391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644441 + ... + 644450.

It is an arithmetic number, because the mean of its divisors is an integer number (1933338).

Almost surely, 2^6444455 is an apocalyptic number.

6444455 is a deficient number, since it is larger than the sum of its proper divisors (1288897).

6444455 is a wasteful number, since it uses less digits than its factorization.

6444455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288896.

The product of its digits is 38400, while the sum is 32.

The square root of 6444455 is about 2538.5931143056. The cubic root of 6444455 is about 186.0924406574.

Subtracting from 6444455 its reverse (5544446), we obtain a palindrome (900009).

The spelling of 6444455 in words is "six million, four hundred forty-four thousand, four hundred fifty-five".