6440061 has 4 divisors (see below), whose sum is σ = 8586752.
Its totient is φ = 4293372.
The previous prime is 6440041. The next prime is 6440089. The reversal of 6440061 is 1600446.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is not a de Polignac number, because 6440061 - 25 = 6440029 is a prime.
It is a D-number.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6440011) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073341 + ... + 1073346.
It is an arithmetic number, because the mean of its divisors is an integer number (2146688).
Almost surely, 26440061 is an apocalyptic number.
It is an amenable number.
6440061 is a deficient number, since it is larger than the sum of its proper divisors (2146691).
6440061 is a wasteful number, since it uses less digits than its factorization.
6440061 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2146690.
The product of its (nonzero) digits is 576, while the sum is 21.
The square root of 6440061 is about 2537.7275267451.
The cubic root of 6440061 is about 186.0501367907.
The spelling of 6440061 in words is "six million, four hundred forty thousand, sixty-one".