2540340405 has 24 divisors (see below), whose sum is σ = 4555095480. Its totient is φ = 1308128640.

The previous prime is 2540340389. The next prime is 2540340427. The reversal of 2540340405 is 5040430452.

2540340405 is a `hidden beast` number, since 254 + 0 + 3 + 4 + 0 + 405 = 666.

2540340405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77898276 + 2462442129 = 8826^2 + 49623^2 .

It is not a de Polignac number, because 2540340405 - 2⁴ = 2540340389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 972006 + ... + 974615.

It is an arithmetic number, because the mean of its divisors is an integer number (189795645).

Almost surely, 2^2540340405 is an apocalyptic number.

It is an amenable number.

2540340405 is a deficient number, since it is larger than the sum of its proper divisors (2014755075).

2540340405 is a wasteful number, since it uses less digits than its factorization.

2540340405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946661 (or 1946658 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 2540340405 is about 50401.7897003668. The cubic root of 2540340405 is about 1364.4699386990.

Adding to 2540340405 its reverse (5040430452), we get a palindrome (7580770857).

The spelling of 2540340405 in words is "two billion, five hundred forty million, three hundred forty thousand, four hundred five".