1355209 has 8 divisors (see below), whose sum is σ = 1395360. Its totient is φ = 1315776.

The previous prime is 1355191. The next prime is 1355219. The reversal of 1355209 is 9025531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355209 is a prime.

It is a Duffinian number.

1355209 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1355219) 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 in 7 ways as a sum of consecutive naturals, for example, 7482 + ... + 7660.

It is an arithmetic number, because the mean of its divisors is an integer number (174420).

2^1355209 is an apocalyptic number.

It is an amenable number.

1355209 is a deficient number, since it is larger than the sum of its proper divisors (40151).

1355209 is a wasteful number, since it uses less digits than its factorization.

1355209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 1355209 is about 1164.1344424077. The cubic root of 1355209 is about 110.6629115595.

It can be divided in two parts, 13 and 55209, that multiplied together give a palindrome (717717).

The spelling of 1355209 in words is "one million, three hundred fifty-five thousand, two hundred nine".