1378298639 has 2 divisors, whose sum is σ = 1378298640. Its totient is φ = 1378298638.

The previous prime is 1378298611. The next prime is 1378298687. The reversal of 1378298639 is 9368928731.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378298639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378298609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689149319 + 689149320.

It is an arithmetic number, because the mean of its divisors is an integer number (689149320).

Almost surely, 2^1378298639 is an apocalyptic number.

1378298639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378298639 is an equidigital number, since it uses as much as digits as its factorization.

1378298639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 1378298639 is about 37125.4446303341. Note that the first 3 decimals coincide. The cubic root of 1378298639 is about 1112.8785602910.

The spelling of 1378298639 in words is "one billion, three hundred seventy-eight million, two hundred ninety-eight thousand, six hundred thirty-nine".