6440247147 has 4 divisors (see below), whose sum is σ = 8586996200. Its totient is φ = 4293498096.

The previous prime is 6440247133. The next prime is 6440247167. The reversal of 6440247147 is 7417420446.

It is a happy number.

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

It is not a de Polignac number, because 6440247147 - 2⁶ = 6440247083 is a prime.

It is a super-3 number, since 3×6440247147³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440247167) 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, 1073374522 + ... + 1073374527.

It is an arithmetic number, because the mean of its divisors is an integer number (2146749050).

Almost surely, 2^6440247147 is an apocalyptic number.

6440247147 is a deficient number, since it is larger than the sum of its proper divisors (2146749053).

6440247147 is a wasteful number, since it uses less digits than its factorization.

6440247147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146749052.

The product of its (nonzero) digits is 150528, while the sum is 39.

The square root of 6440247147 is about 80251.1504403519. The cubic root of 6440247147 is about 1860.5192933794.

The spelling of 6440247147 in words is "six billion, four hundred forty million, two hundred forty-seven thousand, one hundred forty-seven".