2543440387 has 2 divisors, whose sum is σ = 2543440388. Its totient is φ = 2543440386.

The previous prime is 2543440379. The next prime is 2543440423. The reversal of 2543440387 is 7830443452.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2543440387 - 2³ = 2543440379 is a prime.

It is not a weakly prime, because it can be changed into another prime (2543440327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271720193 + 1271720194.

It is an arithmetic number, because the mean of its divisors is an integer number (1271720194).

Almost surely, 2^2543440387 is an apocalyptic number.

2543440387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543440387 is an equidigital number, since it uses as much as digits as its factorization.

2543440387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 2543440387 is about 50432.5330218501. The cubic root of 2543440387 is about 1365.0247348003.

The spelling of 2543440387 in words is "two billion, five hundred forty-three million, four hundred forty thousand, three hundred eighty-seven".