6446401 has 4 divisors (see below), whose sum is σ = 6942292. Its totient is φ = 5950512.

The previous prime is 6446387. The next prime is 6446413. The reversal of 6446401 is 1046446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 3418801 = 1740^2 + 1849^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446401 - 2¹¹ = 6444353 is a prime.

It is a Duffinian number.

6446401 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6446101) 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, 247926 + ... + 247951.

It is an arithmetic number, because the mean of its divisors is an integer number (1735573).

Almost surely, 2^6446401 is an apocalyptic number.

It is an amenable number.

6446401 is a deficient number, since it is larger than the sum of its proper divisors (495891).

6446401 is a wasteful number, since it uses less digits than its factorization.

6446401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495890.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 6446401 is about 2538.9763685391. The cubic root of 6446401 is about 186.1111699083. Note that the first 4 decimals are identical.

The spelling of 6446401 in words is "six million, four hundred forty-six thousand, four hundred one".