1378814965 has 12 divisors (see below), whose sum is σ = 1818669132. Its totient is φ = 1002774080.

The previous prime is 1378814911. The next prime is 1378814989. The reversal of 1378814965 is 5694188731.

It can be written as a sum of positive squares in 2 ways, for example, as 737611281 + 641203684 = 27159^2 + 25322^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1378814965 is a prime.

It is a super-2 number, since 2×1378814965² = 3802261415415902450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 1138912 + ... + 1140121.

It is an arithmetic number, because the mean of its divisors is an integer number (151555761).

Almost surely, 2^1378814965 is an apocalyptic number.

It is an amenable number.

1378814965 is a deficient number, since it is larger than the sum of its proper divisors (439854167).

1378814965 is a wasteful number, since it uses less digits than its factorization.

1378814965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279060 (or 2279049 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 52.

The square root of 1378814965 is about 37132.3977814523. The cubic root of 1378814965 is about 1113.0175085041.

The spelling of 1378814965 in words is "one billion, three hundred seventy-eight million, eight hundred fourteen thousand, nine hundred sixty-five".