6405445 has 4 divisors (see below), whose sum is σ = 7686540. Its totient is φ = 5124352.

The previous prime is 6405397. The next prime is 6405457. The reversal of 6405445 is 5445046.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2070721 + 4334724 = 1439^2 + 2082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6405445 is a prime.

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, 640540 + ... + 640549.

It is an arithmetic number, because the mean of its divisors is an integer number (1921635).

Almost surely, 2^6405445 is an apocalyptic number.

It is an amenable number.

6405445 is a deficient number, since it is larger than the sum of its proper divisors (1281095).

6405445 is a wasteful number, since it uses less digits than its factorization.

6405445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281094.

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

The square root of 6405445 is about 2530.8980619535. The cubic root of 6405445 is about 185.7161914428.

The spelling of 6405445 in words is "six million, four hundred five thousand, four hundred forty-five".