1378665135 has 12 divisors (see below), whose sum is σ = 2389686312. Its totient is φ = 735288048.

The previous prime is 1378665121. The next prime is 1378665143. The reversal of 1378665135 is 5315668731.

1378665135 is a `hidden beast` number, since 1 + 3 + 78 + 66 + 513 + 5 = 666.

It is not a de Polignac number, because 1378665135 - 2²⁶ = 1311556271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 30637003 = 1378665135 / (1 + 3 + 7 + 8 + 6 + 6 + 5 + 1 + 3 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15318457 + ... + 15318546.

It is an arithmetic number, because the mean of its divisors is an integer number (199140526).

Almost surely, 2^1378665135 is an apocalyptic number.

1378665135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1378665135 is a deficient number, since it is larger than the sum of its proper divisors (1011021177).

1378665135 is a wasteful number, since it uses less digits than its factorization.

1378665135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30637014 (or 30637011 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1378665135 is about 37130.3802162057. The cubic root of 1378665135 is about 1112.9771914061.

The spelling of 1378665135 in words is "one billion, three hundred seventy-eight million, six hundred sixty-five thousand, one hundred thirty-five".