1378444389 has 16 divisors (see below), whose sum is σ = 2134922880. Its totient is φ = 774768960.

The previous prime is 1378444387. The next prime is 1378444393. The reversal of 1378444389 is 9834448731.

It is not a de Polignac number, because 1378444389 - 2¹ = 1378444387 is a prime.

It is a super-3 number, since 3×1378444389³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378444387) 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 in 15 ways as a sum of consecutive naturals, for example, 536754 + ... + 539315.

It is an arithmetic number, because the mean of its divisors is an integer number (133432680).

Almost surely, 2^1378444389 is an apocalyptic number.

It is an amenable number.

1378444389 is a deficient number, since it is larger than the sum of its proper divisors (756478491).

1378444389 is a wasteful number, since it uses less digits than its factorization.

1378444389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076140.

The product of its digits is 2322432, while the sum is 51.

The square root of 1378444389 is about 37127.4075178971. The cubic root of 1378444389 is about 1112.9177865101.

The spelling of 1378444389 in words is "one billion, three hundred seventy-eight million, four hundred forty-four thousand, three hundred eighty-nine".