378984505 has 4 divisors (see below), whose sum is σ = 454781412. Its totient is φ = 303187600.

The previous prime is 378984491. The next prime is 378984511. The reversal of 378984505 is 505489873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505489873 = 7 ⋅72212839.

It can be written as a sum of positive squares in 2 ways, for example, as 109893289 + 269091216 = 10483^2 + 16404^2 .

It is not a de Polignac number, because 378984505 - 2⁹ = 378983993 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37898446 + ... + 37898455.

It is an arithmetic number, because the mean of its divisors is an integer number (113695353).

Almost surely, 2^378984505 is an apocalyptic number.

It is an amenable number.

378984505 is a deficient number, since it is larger than the sum of its proper divisors (75796907).

378984505 is an equidigital number, since it uses as much as digits as its factorization.

378984505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75796906.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The square root of 378984505 is about 19467.5243675204. The cubic root of 378984505 is about 723.6698591715.

The spelling of 378984505 in words is "three hundred seventy-eight million, nine hundred eighty-four thousand, five hundred five".