356809 has 4 divisors (see below), whose sum is σ = 358020. Its totient is φ = 355600.

The previous prime is 356803. The next prime is 356819. The reversal of 356809 is 908653.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 299209 + 57600 = 547^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 356809 - 2¹³ = 348617 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 356809.

It is not an unprimeable number, because it can be changed into a prime (356803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159 + ... + 859.

It is an arithmetic number, because the mean of its divisors is an integer number (89505).

2³⁵⁶⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

356809 is a deficient number, since it is larger than the sum of its proper divisors (1211).

356809 is an equidigital number, since it uses as much as digits as its factorization.

356809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 356809 is about 597.3349144324. The cubic root of 356809 is about 70.9270559446.

The spelling of 356809 in words is "three hundred fifty-six thousand, eight hundred nine".