378509 has 2 divisors, whose sum is σ = 378510. Its totient is φ = 378508.

The previous prime is 378503. The next prime is 378523. The reversal of 378509 is 905873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 157609 = 470^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 378509 - 2⁴ = 378493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189254 + 189255.

It is an arithmetic number, because the mean of its divisors is an integer number (189255).

2³⁷⁸⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

378509 is a deficient number, since it is larger than the sum of its proper divisors (1).

378509 is an equidigital number, since it uses as much as digits as its factorization.

378509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 378509 is about 615.2308509820. The cubic root of 378509 is about 72.3367074011.

The spelling of 378509 in words is "three hundred seventy-eight thousand, five hundred nine".