378840217 has 6 divisors (see below), whose sum is σ = 440691738. Its totient is φ = 324720144.

The previous prime is 378840211. The next prime is 378840227. The reversal of 378840217 is 712048873.

It can be written as a sum of positive squares in only one way, i.e., 365995161 + 12845056 = 19131^2 + 3584^2 .

It is not a de Polignac number, because 378840217 - 2⁷ = 378840089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378840217.

It is not an unprimeable number, because it can be changed into a prime (378840211) 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 5 ways as a sum of consecutive naturals, for example, 3865668 + ... + 3865765.

It is an arithmetic number, because the mean of its divisors is an integer number (73448623).

Almost surely, 2^378840217 is an apocalyptic number.

It is an amenable number.

378840217 is a deficient number, since it is larger than the sum of its proper divisors (61851521).

378840217 is an equidigital number, since it uses as much as digits as its factorization.

378840217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7731447 (or 7731440 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 378840217 is about 19463.8181506096. The cubic root of 378840217 is about 723.5780083356.

The spelling of 378840217 in words is "three hundred seventy-eight million, eight hundred forty thousand, two hundred seventeen".