401209 has 2 divisors, whose sum is σ = 401210. Its totient is φ = 401208.

The previous prime is 401201. The next prime is 401231. The reversal of 401209 is 902104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 41209 = 600^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 401209 - 2³ = 401201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401192 and 401201.

It is not a weakly prime, because it can be changed into another prime (401201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200604 + 200605.

It is an arithmetic number, because the mean of its divisors is an integer number (200605).

2⁴⁰¹²⁰⁹ is an apocalyptic number.

It is an amenable number.

401209 is a deficient number, since it is larger than the sum of its proper divisors (1).

401209 is an equidigital number, since it uses as much as digits as its factorization.

401209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 401209 is about 633.4106093207. The cubic root of 401209 is about 73.7547885429.

The spelling of 401209 in words is "four hundred one thousand, two hundred nine".