378165809 has 8 divisors (see below), whose sum is σ = 438277248. Its totient is φ = 319576320.

The previous prime is 378165773. The next prime is 378165817. The reversal of 378165809 is 908561873.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 378165809 - 2⁸ = 378165553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378165209) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 379952 + ... + 380945.

It is an arithmetic number, because the mean of its divisors is an integer number (54784656).

Almost surely, 2^378165809 is an apocalyptic number.

It is an amenable number.

378165809 is a deficient number, since it is larger than the sum of its proper divisors (60111439).

378165809 is an equidigital number, since it uses as much as digits as its factorization.

378165809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760975.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 378165809 is about 19446.4857750700. The cubic root of 378165809 is about 723.1483842424.

The spelling of 378165809 in words is "three hundred seventy-eight million, one hundred sixty-five thousand, eight hundred nine".