378948109 has 2 divisors, whose sum is σ = 378948110. Its totient is φ = 378948108.

The previous prime is 378948107. The next prime is 378948113. The reversal of 378948109 is 901849873.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197964900 + 180983209 = 14070^2 + 13453^2 .

It is an emirp because it is prime and its reverse (901849873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378948109 - 2¹ = 378948107 is a prime.

Together with 378948107, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378948107) 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 as a sum of consecutive naturals, namely, 189474054 + 189474055.

It is an arithmetic number, because the mean of its divisors is an integer number (189474055).

Almost surely, 2^378948109 is an apocalyptic number.

It is an amenable number.

378948109 is a deficient number, since it is larger than the sum of its proper divisors (1).

378948109 is an equidigital number, since it uses as much as digits as its factorization.

378948109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 378948109 is about 19466.5895574957. The cubic root of 378948109 is about 723.6466924096.

The spelling of 378948109 in words is "three hundred seventy-eight million, nine hundred forty-eight thousand, one hundred nine".