1378913993 has 2 divisors, whose sum is σ = 1378913994. Its totient is φ = 1378913992.

The previous prime is 1378913989. The next prime is 1378914001. The reversal of 1378913993 is 3993198731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1242421504 + 136492489 = 35248^2 + 11683^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378913993 - 2² = 1378913989 is a prime.

It is not a weakly prime, because it can be changed into another prime (1378913093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689456996 + 689456997.

It is an arithmetic number, because the mean of its divisors is an integer number (689456997).

Almost surely, 2^1378913993 is an apocalyptic number.

It is an amenable number.

1378913993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378913993 is an equidigital number, since it uses as much as digits as its factorization.

1378913993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 53.

The square root of 1378913993 is about 37133.7312022371. The cubic root of 1378913993 is about 1113.0441539115.

The spelling of 1378913993 in words is "one billion, three hundred seventy-eight million, nine hundred thirteen thousand, nine hundred ninety-three".