350809 has 2 divisors, whose sum is σ = 350810. Its totient is φ = 350808.

The previous prime is 350803. The next prime is 350843. The reversal of 350809 is 908053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230400 + 120409 = 480^2 + 347^2 .

It is an emirp because it is prime and its reverse (908053) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-350809 is a prime.

350809 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (350803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175404 + 175405.

It is an arithmetic number, because the mean of its divisors is an integer number (175405).

2³⁵⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

350809 is a deficient number, since it is larger than the sum of its proper divisors (1).

350809 is an equidigital number, since it uses as much as digits as its factorization.

350809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 350809 is about 592.2913134599. The cubic root of 350809 is about 70.5272432980.

The spelling of 350809 in words is "three hundred fifty thousand, eight hundred nine".