378809 has 2 divisors, whose sum is σ = 378810. Its totient is φ = 378808.

The previous prime is 378793. The next prime is 378817. The reversal of 378809 is 908873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222784 + 156025 = 472^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 378809 - 2⁴ = 378793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189404 + 189405.

It is an arithmetic number, because the mean of its divisors is an integer number (189405).

2³⁷⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

378809 is a deficient number, since it is larger than the sum of its proper divisors (1).

378809 is an equidigital number, since it uses as much as digits as its factorization.

378809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 378809 is about 615.4746136113. The cubic root of 378809 is about 72.3558133153.

The spelling of 378809 in words is "three hundred seventy-eight thousand, eight hundred nine".