378641009 has 2 divisors, whose sum is σ = 378641010. Its totient is φ = 378641008.

The previous prime is 378640993. The next prime is 378641041. The reversal of 378641009 is 900146873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285711409 + 92929600 = 16903^2 + 9640^2 .

It is a cyclic number.

It is not a de Polignac number, because 378641009 - 2⁴ = 378640993 is a prime.

It is not a weakly prime, because it can be changed into another prime (378641059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189320504 + 189320505.

It is an arithmetic number, because the mean of its divisors is an integer number (189320505).

Almost surely, 2^378641009 is an apocalyptic number.

It is an amenable number.

378641009 is a deficient number, since it is larger than the sum of its proper divisors (1).

378641009 is an equidigital number, since it uses as much as digits as its factorization.

378641009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 378641009 is about 19458.7000850519. The cubic root of 378641009 is about 723.4511581985.

The spelling of 378641009 in words is "three hundred seventy-eight million, six hundred forty-one thousand, nine".