1378367565 has 32 divisors (see below), whose sum is σ = 2339508096. Its totient is φ = 690585600.

The previous prime is 1378367533. The next prime is 1378367581. The reversal of 1378367565 is 5657638731.

It is not a de Polignac number, because 1378367565 - 2⁵ = 1378367533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138765 + ... + 148365.

It is an arithmetic number, because the mean of its divisors is an integer number (73109628).

Almost surely, 2^1378367565 is an apocalyptic number.

1378367565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378367565 is a deficient number, since it is larger than the sum of its proper divisors (961140531).

1378367565 is a wasteful number, since it uses less digits than its factorization.

1378367565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10189.

The product of its digits is 3175200, while the sum is 51.

The square root of 1378367565 is about 37126.3729039075. The cubic root of 1378367565 is about 1112.8971109367.

The spelling of 1378367565 in words is "one billion, three hundred seventy-eight million, three hundred sixty-seven thousand, five hundred sixty-five".