1378365265 has 8 divisors (see below), whose sum is σ = 1694380968. Its totient is φ = 1075797120.

The previous prime is 1378365251. The next prime is 1378365269. The reversal of 1378365265 is 5625638731.

It can be written as a sum of positive squares in 4 ways, for example, as 173889 + 1378191376 = 417^2 + 37124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1378365265 - 2⁹ = 1378364753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378365269) 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 7 ways as a sum of consecutive naturals, for example, 3361662 + ... + 3362071.

It is an arithmetic number, because the mean of its divisors is an integer number (211797621).

Almost surely, 2^1378365265 is an apocalyptic number.

It is an amenable number.

1378365265 is a deficient number, since it is larger than the sum of its proper divisors (316015703).

1378365265 is an equidigital number, since it uses as much as digits as its factorization.

1378365265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6723779.

The product of its digits is 907200, while the sum is 46.

The square root of 1378365265 is about 37126.3419286091. The cubic root of 1378365265 is about 1112.8964919280.

It can be divided in two parts, 1378365 and 265, that added together give a triangular number (1378630 = T₁₆₆₀).

The spelling of 1378365265 in words is "one billion, three hundred seventy-eight million, three hundred sixty-five thousand, two hundred sixty-five".