1355809 has 16 divisors (see below), whose sum is σ = 1709568. Its totient is φ = 1046592.

The previous prime is 1355807. The next prime is 1355819. The reversal of 1355809 is 9085531.

It is a cyclic number.

It is not a de Polignac number, because 1355809 - 2¹ = 1355807 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1355803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4119 + ... + 4435.

It is an arithmetic number, because the mean of its divisors is an integer number (106848).

2^1355809 is an apocalyptic number.

It is an amenable number.

1355809 is a deficient number, since it is larger than the sum of its proper divisors (353759).

1355809 is a wasteful number, since it uses less digits than its factorization.

1355809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1355809 is about 1164.3921160846. The cubic root of 1355809 is about 110.6792406400.

The spelling of 1355809 in words is "one million, three hundred fifty-five thousand, eight hundred nine".