2540340401 has 4 divisors (see below), whose sum is σ = 2550225252. Its totient is φ = 2530455552.

The previous prime is 2540340389. The next prime is 2540340427. The reversal of 2540340401 is 1040430452.

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 2342656801 + 197683600 = 48401^2 + 14060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540340401 - 2¹⁸ = 2540078257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540340461) 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, 4942040 + ... + 4942553.

It is an arithmetic number, because the mean of its divisors is an integer number (637556313).

Almost surely, 2^2540340401 is an apocalyptic number.

It is an amenable number.

2540340401 is a deficient number, since it is larger than the sum of its proper divisors (9884851).

2540340401 is an equidigital number, since it uses as much as digits as its factorization.

2540340401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9884850.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2540340401 is about 50401.7896606857. The cubic root of 2540340401 is about 1364.4699379828.

Adding to 2540340401 its reverse (1040430452), we get a palindrome (3580770853).

The spelling of 2540340401 in words is "two billion, five hundred forty million, three hundred forty thousand, four hundred one".