2540001 has 4 divisors (see below), whose sum is σ = 3386672. Its totient is φ = 1693332.

The previous prime is 2539997. The next prime is 2540011. The reversal of 2540001 is 1000452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2540001 - 2² = 2539997 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

2540001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2540011) 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, 423331 + ... + 423336.

It is an arithmetic number, because the mean of its divisors is an integer number (846668).

2^2540001 is an apocalyptic number.

It is an amenable number.

2540001 is a deficient number, since it is larger than the sum of its proper divisors (846671).

2540001 is an equidigital number, since it uses as much as digits as its factorization.

2540001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846670.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 2540001 is about 1593.7380587788. The cubic root of 2540001 is about 136.4409168819.

Adding to 2540001 its reverse (1000452), we get a palindrome (3540453).

The spelling of 2540001 in words is "two million, five hundred forty thousand, one".