1380087865 has 8 divisors (see below), whose sum is σ = 1783498248. Its totient is φ = 1019141760.

The previous prime is 1380087859. The next prime is 1380087869. The reversal of 1380087865 is 5687800831.

It can be written as a sum of positive squares in 4 ways, for example, as 9903609 + 1370184256 = 3147^2 + 37016^2 .

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

It is not a de Polignac number, because 1380087865 - 2¹⁵ = 1380055097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380087869) 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, 10615996 + ... + 10616125.

It is an arithmetic number, because the mean of its divisors is an integer number (222937281).

Almost surely, 2^1380087865 is an apocalyptic number.

It is an amenable number.

1380087865 is a deficient number, since it is larger than the sum of its proper divisors (403410383).

1380087865 is a wasteful number, since it uses less digits than its factorization.

1380087865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21232139.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 1380087865 is about 37149.5338463351. The cubic root of 1380087865 is about 1113.3599098341.

The spelling of 1380087865 in words is "one billion, three hundred eighty million, eighty-seven thousand, eight hundred sixty-five".