1378540391 has 2 divisors, whose sum is σ = 1378540392. Its totient is φ = 1378540390.

The previous prime is 1378540363. The next prime is 1378540451. The reversal of 1378540391 is 1930458731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1378540391 - 2⁶ = 1378540327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378540301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689270195 + 689270196.

It is an arithmetic number, because the mean of its divisors is an integer number (689270196).

Almost surely, 2^1378540391 is an apocalyptic number.

1378540391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378540391 is an equidigital number, since it uses as much as digits as its factorization.

1378540391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 1378540391 is about 37128.7003677748. The cubic root of 1378540391 is about 1112.9436223615.

The spelling of 1378540391 in words is "one billion, three hundred seventy-eight million, five hundred forty thousand, three hundred ninety-one".