378665623 has 4 divisors (see below), whose sum is σ = 432760720. Its totient is φ = 324570528.

The previous prime is 378665621. The next prime is 378665641. The reversal of 378665623 is 326566873.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 378665623 - 2¹ = 378665621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378665621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27047538 + ... + 27047551.

It is an arithmetic number, because the mean of its divisors is an integer number (108190180).

Almost surely, 2^378665623 is an apocalyptic number.

378665623 is a deficient number, since it is larger than the sum of its proper divisors (54095097).

378665623 is an equidigital number, since it uses as much as digits as its factorization.

378665623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54095096.

The product of its digits is 1088640, while the sum is 46.

The square root of 378665623 is about 19459.3325425103. The cubic root of 378665623 is about 723.4668341207.

The spelling of 378665623 in words is "three hundred seventy-eight million, six hundred sixty-five thousand, six hundred twenty-three".