1378758865 has 32 divisors (see below), whose sum is σ = 1888427520. Its totient is φ = 957388800.

The previous prime is 1378758859. The next prime is 1378758877. The reversal of 1378758865 is 5688578731.

It is a happy number.

It is not a de Polignac number, because 1378758865 - 2¹³ = 1378750673 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 99481 + ... + 112489.

It is an arithmetic number, because the mean of its divisors is an integer number (59013360).

Almost surely, 2^1378758865 is an apocalyptic number.

It is an amenable number.

1378758865 is a deficient number, since it is larger than the sum of its proper divisors (509668655).

1378758865 is a wasteful number, since it uses less digits than its factorization.

1378758865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13113.

The product of its digits is 11289600, while the sum is 58.

The square root of 1378758865 is about 37131.6423687399. The cubic root of 1378758865 is about 1113.0024131431.

The spelling of 1378758865 in words is "one billion, three hundred seventy-eight million, seven hundred fifty-eight thousand, eight hundred sixty-five".