6426505 has 4 divisors (see below), whose sum is σ = 7711812. Its totient is φ = 5141200.

The previous prime is 6426491. The next prime is 6426509. The reversal of 6426505 is 5056246.

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 2782224 + 3644281 = 1668^2 + 1909^2 .

It is not a de Polignac number, because 6426505 - 2⁵ = 6426473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6426509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642646 + ... + 642655.

It is an arithmetic number, because the mean of its divisors is an integer number (1927953).

Almost surely, 2^6426505 is an apocalyptic number.

It is an amenable number.

6426505 is a deficient number, since it is larger than the sum of its proper divisors (1285307).

6426505 is a wasteful number, since it uses less digits than its factorization.

6426505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285306.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 6426505 is about 2535.0552262229. The cubic root of 6426505 is about 185.9195030718.

It can be divided in two parts, 64 and 26505, that added together give a square (26569 = 163²).

The spelling of 6426505 in words is "six million, four hundred twenty-six thousand, five hundred five".