1378645365 has 16 divisors (see below), whose sum is σ = 2207486016. Its totient is φ = 734726400.

The previous prime is 1378645357. The next prime is 1378645391. The reversal of 1378645365 is 5635468731.

It is not a de Polignac number, because 1378645365 - 2³ = 1378645357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13351 + ... + 54180.

It is an arithmetic number, because the mean of its divisors is an integer number (137967876).

Almost surely, 2^1378645365 is an apocalyptic number.

1378645365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378645365 is a deficient number, since it is larger than the sum of its proper divisors (828840651).

1378645365 is a wasteful number, since it uses less digits than its factorization.

1378645365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68900.

The product of its digits is 1814400, while the sum is 48.

The square root of 1378645365 is about 37130.1139912067. The cubic root of 1378645365 is about 1112.9718713653.

The spelling of 1378645365 in words is "one billion, three hundred seventy-eight million, six hundred forty-five thousand, three hundred sixty-five".