2600401 has 4 divisors (see below), whose sum is σ = 2690100. Its totient is φ = 2510704.

The previous prime is 2600393. The next prime is 2600407. The reversal of 2600401 is 1040062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1040062 = 2 ⋅520031.

It can be written as a sum of positive squares in 2 ways, for example, as 1040400 + 1560001 = 1020^2 + 1249^2 .

It is not a de Polignac number, because 2600401 - 2³ = 2600393 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2600407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44806 + ... + 44863.

It is an arithmetic number, because the mean of its divisors is an integer number (672525).

2^2600401 is an apocalyptic number.

It is an amenable number.

2600401 is a deficient number, since it is larger than the sum of its proper divisors (89699).

2600401 is an equidigital number, since it uses as much as digits as its factorization.

2600401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89698.

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

The square root of 2600401 is about 1612.5758896871. The cubic root of 2600401 is about 137.5139556083.

Adding to 2600401 its reverse (1040062), we get a palindrome (3640463).

The spelling of 2600401 in words is "two million, six hundred thousand, four hundred one".