1378342665 has 24 divisors (see below), whose sum is σ = 2730431808. Its totient is φ = 630099360.

The previous prime is 1378342639. The next prime is 1378342673. The reversal of 1378342665 is 5662438731.

It is not a de Polignac number, because 1378342665 - 2⁸ = 1378342409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1378342665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2187531 + ... + 2188160.

It is an arithmetic number, because the mean of its divisors is an integer number (113767992).

Almost surely, 2^1378342665 is an apocalyptic number.

1378342665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378342665 is a deficient number, since it is larger than the sum of its proper divisors (1352089143).

1378342665 is a wasteful number, since it uses less digits than its factorization.

1378342665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375709 (or 4375706 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 1378342665 is about 37126.0375612588. The cubic root of 1378342665 is about 1112.8904094575.

The spelling of 1378342665 in words is "one billion, three hundred seventy-eight million, three hundred forty-two thousand, six hundred sixty-five".