378940405 has 4 divisors (see below), whose sum is σ = 454728492. Its totient is φ = 303152320.

The previous prime is 378940403. The next prime is 378940423. The reversal of 378940405 is 504049873.

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

It can be written as a sum of positive squares in 2 ways, for example, as 186896241 + 192044164 = 13671^2 + 13858^2 .

It is not a de Polignac number, because 378940405 - 2¹ = 378940403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378940403) 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, 37894036 + ... + 37894045.

It is an arithmetic number, because the mean of its divisors is an integer number (113682123).

Almost surely, 2^378940405 is an apocalyptic number.

It is an amenable number.

378940405 is a deficient number, since it is larger than the sum of its proper divisors (75788087).

378940405 is an equidigital number, since it uses as much as digits as its factorization.

378940405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75788086.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 378940405 is about 19466.3916789938. The cubic root of 378940405 is about 723.6417884735.

The spelling of 378940405 in words is "three hundred seventy-eight million, nine hundred forty thousand, four hundred five".