394209 has 6 divisors (see below), whose sum is σ = 569426. Its totient is φ = 262800.

The previous prime is 394201. The next prime is 394211. The reversal of 394209 is 902493.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 51984 = 585^2 + 228^2 .

It is not a de Polignac number, because 394209 - 2³ = 394201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21892 + ... + 21909.

2³⁹⁴²⁰⁹ is an apocalyptic number.

It is an amenable number.

394209 is a deficient number, since it is larger than the sum of its proper divisors (175217).

394209 is a wasteful number, since it uses less digits than its factorization.

394209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43807 (or 43804 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 394209 is about 627.8606533300. The cubic root of 394209 is about 73.3233296731.

The spelling of 394209 in words is "three hundred ninety-four thousand, two hundred nine".