2540420205 has 16 divisors (see below), whose sum is σ = 4068898944. Its totient is φ = 1353481920.

The previous prime is 2540420191. The next prime is 2540420287. The reversal of 2540420205 is 5020240452.

It is a happy number.

It is not a de Polignac number, because 2540420205 - 2²⁰ = 2539371629 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73066 + ... + 102075.

It is an arithmetic number, because the mean of its divisors is an integer number (254306184).

Almost surely, 2^2540420205 is an apocalyptic number.

It is an amenable number.

2540420205 is a deficient number, since it is larger than the sum of its proper divisors (1528478739).

2540420205 is a wasteful number, since it uses less digits than its factorization.

2540420205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176116.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 2540420205 is about 50402.5813327056. The cubic root of 2540420205 is about 1364.4842259655.

Adding to 2540420205 its reverse (5020240452), we get a palindrome (7560660657).

The spelling of 2540420205 in words is "two billion, five hundred forty million, four hundred twenty thousand, two hundred five".