2540340389 has 2 divisors, whose sum is σ = 2540340390. Its totient is φ = 2540340388.

The previous prime is 2540340371. The next prime is 2540340427. The reversal of 2540340389 is 9830430452.

It is an a-pointer prime, because the next prime (2540340427) can be obtained adding 2540340389 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2322276100 + 218064289 = 48190^2 + 14767^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540340389 - 2²⁴ = 2523563173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540310389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270170194 + 1270170195.

It is an arithmetic number, because the mean of its divisors is an integer number (1270170195).

Almost surely, 2^2540340389 is an apocalyptic number.

It is an amenable number.

2540340389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540340389 is an equidigital number, since it uses as much as digits as its factorization.

2540340389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 2540340389 is about 50401.7895416423. The cubic root of 2540340389 is about 1364.4699358344.

The spelling of 2540340389 in words is "two billion, five hundred forty million, three hundred forty thousand, three hundred eighty-nine".