6439801 has 4 divisors (see below), whose sum is σ = 6444900. Its totient is φ = 6434704.

The previous prime is 6439777. The next prime is 6439819. The reversal of 6439801 is 1089346.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4752400 + 1687401 = 2180^2 + 1299^2 .

It is a cyclic number.

It is not a de Polignac number, because 6439801 - 2¹⁵ = 6407033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6439001) 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, 915 + ... + 3703.

It is an arithmetic number, because the mean of its divisors is an integer number (1611225).

Almost surely, 2^6439801 is an apocalyptic number.

It is an amenable number.

6439801 is a deficient number, since it is larger than the sum of its proper divisors (5099).

6439801 is a wasteful number, since it uses less digits than its factorization.

6439801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 6439801 is about 2537.6762992943. The cubic root of 6439801 is about 186.0476330004.

The spelling of 6439801 in words is "six million, four hundred thirty-nine thousand, eight hundred one".