655409 has 4 divisors (see below), whose sum is σ = 657216. Its totient is φ = 653604.

The previous prime is 655399. The next prime is 655439. The reversal of 655409 is 904556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655409 - 2¹⁶ = 589873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (164304).

2⁶⁵⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

655409 is a deficient number, since it is larger than the sum of its proper divisors (1807).

655409 is a wasteful number, since it uses less digits than its factorization.

655409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 655409 is about 809.5733444229. The cubic root of 655409 is about 86.8635284958.

The spelling of 655409 in words is "six hundred fifty-five thousand, four hundred nine".