6440147 has 4 divisors (see below), whose sum is σ = 7360176. Its totient is φ = 5520120.

The previous prime is 6440143. The next prime is 6440149. The reversal of 6440147 is 7410446.

6440147 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6440147 - 2² = 6440143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440141) 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, 460004 + ... + 460017.

It is an arithmetic number, because the mean of its divisors is an integer number (1840044).

Almost surely, 2^6440147 is an apocalyptic number.

6440147 is a deficient number, since it is larger than the sum of its proper divisors (920029).

6440147 is an equidigital number, since it uses as much as digits as its factorization.

6440147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920028.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 6440147 is about 2537.7444709821. The cubic root of 6440147 is about 186.0509649526.

Subtracting 6440147 from its reverse (7410446), we obtain a cube (970299 = 99³).

The spelling of 6440147 in words is "six million, four hundred forty thousand, one hundred forty-seven".