1378913989 has 2 divisors, whose sum is σ = 1378913990. Its totient is φ = 1378913988.

The previous prime is 1378913969. The next prime is 1378913993. The reversal of 1378913989 is 9893198731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1013912964 + 365001025 = 31842^2 + 19105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378913989 - 2⁹ = 1378913477 is a prime.

It is a super-3 number, since 3×1378913989³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378913909) 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, 689456994 + 689456995.

It is an arithmetic number, because the mean of its divisors is an integer number (689456995).

Almost surely, 2^1378913989 is an apocalyptic number.

It is an amenable number.

1378913989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378913989 is an equidigital number, since it uses as much as digits as its factorization.

1378913989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 58.

The square root of 1378913989 is about 37133.7311483778. The cubic root of 1378913989 is about 1113.0441528352.

The spelling of 1378913989 in words is "one billion, three hundred seventy-eight million, nine hundred thirteen thousand, nine hundred eighty-nine".