2006401 has 4 divisors (see below), whose sum is σ = 2012500. Its totient is φ = 2000304.

The previous prime is 2006393. The next prime is 2006429. The reversal of 2006401 is 1046002.

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 602176 + 1404225 = 776^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006401 - 2³ = 2006393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006441) 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, 2526 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (503125).

2^2006401 is an apocalyptic number.

It is an amenable number.

2006401 is a deficient number, since it is larger than the sum of its proper divisors (6099).

2006401 is an equidigital number, since it uses as much as digits as its factorization.

2006401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6098.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2006401 is about 1416.4748497591. The cubic root of 2006401 is about 126.1263744254.

The spelling of 2006401 in words is "two million, six thousand, four hundred one".