6447145 has 4 divisors (see below), whose sum is σ = 7736580. Its totient is φ = 5157712.

The previous prime is 6447121. The next prime is 6447149. The reversal of 6447145 is 5417446.

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 1212201 + 5234944 = 1101^2 + 2288^2 .

It is a cyclic number.

It is not a de Polignac number, because 6447145 - 2⁵ = 6447113 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6447149) 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, 644710 + ... + 644719.

It is an arithmetic number, because the mean of its divisors is an integer number (1934145).

Almost surely, 2^6447145 is an apocalyptic number.

It is an amenable number.

6447145 is a deficient number, since it is larger than the sum of its proper divisors (1289435).

6447145 is a wasteful number, since it uses less digits than its factorization.

6447145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289434.

The product of its digits is 13440, while the sum is 31.

The square root of 6447145 is about 2539.1228800513. The cubic root of 6447145 is about 186.1183295303.

It can be divided in two parts, 64471 and 45, that added together give a square (64516 = 254²).

The spelling of 6447145 in words is "six million, four hundred forty-seven thousand, one hundred forty-five".