6400441 has 4 divisors (see below), whose sum is σ = 6416500. Its totient is φ = 6384384.

The previous prime is 6400423. The next prime is 6400451. The reversal of 6400441 is 1440046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1440046 = 2 ⋅720023.

It can be written as a sum of positive squares in 2 ways, for example, as 3594816 + 2805625 = 1896^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400441 - 2⁹ = 6399929 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (6400411) 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, 7416 + ... + 8233.

It is an arithmetic number, because the mean of its divisors is an integer number (1604125).

Almost surely, 2^6400441 is an apocalyptic number.

It is an amenable number.

6400441 is a deficient number, since it is larger than the sum of its proper divisors (16059).

6400441 is a wasteful number, since it uses less digits than its factorization.

6400441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16058.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 6400441 is about 2529.9092869113. The cubic root of 6400441 is about 185.6678177063.

Adding to 6400441 its reverse (1440046), we get a palindrome (7840487).

It can be divided in two parts, 6400 and 441, that multiplied together give a square (2822400 = 1680²).

The spelling of 6400441 in words is "six million, four hundred thousand, four hundred forty-one".