1409209 has 2 divisors, whose sum is σ = 1409210. Its totient is φ = 1409208.

The previous prime is 1409207. The next prime is 1409227. The reversal of 1409209 is 9029041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1357225 + 51984 = 1165^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1409209 - 2¹ = 1409207 is a prime.

Together with 1409207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1409203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 704604 + 704605.

It is an arithmetic number, because the mean of its divisors is an integer number (704605).

2^1409209 is an apocalyptic number.

It is an amenable number.

1409209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1409209 is an equidigital number, since it uses as much as digits as its factorization.

1409209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1409209 is about 1187.1010908933. The cubic root of 1409209 is about 112.1136442148.

The spelling of 1409209 in words is "one million, four hundred nine thousand, two hundred nine".