6442401 has 8 divisors (see below), whose sum is σ = 9817024. Its totient is φ = 3681360.

The previous prime is 6442399. The next prime is 6442427. The reversal of 6442401 is 1042446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6442401 - 2¹ = 6442399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 306781 = 6442401 / (6 + 4 + 4 + 2 + 4 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6442481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153370 + ... + 153411.

It is an arithmetic number, because the mean of its divisors is an integer number (1227128).

Almost surely, 2^6442401 is an apocalyptic number.

It is an amenable number.

6442401 is a deficient number, since it is larger than the sum of its proper divisors (3374623).

6442401 is a wasteful number, since it uses less digits than its factorization.

6442401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306791.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 6442401 is about 2538.1885272769. The cubic root of 6442401 is about 186.0726678713.

Adding to 6442401 its reverse (1042446), we get a palindrome (7484847).

The spelling of 6442401 in words is "six million, four hundred forty-two thousand, four hundred one".