654409 has 4 divisors (see below), whose sum is σ = 747904. Its totient is φ = 560916.

The previous prime is 654397. The next prime is 654413. The reversal of 654409 is 904456.

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 654409 - 2¹¹ = 652361 is a prime.

It is a super-2 number, since 2×654409² = 856502278562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654439) 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 3 ways as a sum of consecutive naturals, for example, 46737 + ... + 46750.

It is an arithmetic number, because the mean of its divisors is an integer number (186976).

2⁶⁵⁴⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

654409 is a deficient number, since it is larger than the sum of its proper divisors (93495).

654409 is an equidigital number, since it uses as much as digits as its factorization.

654409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93494.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 654409 is about 808.9554993941. The cubic root of 654409 is about 86.8193282363.

Subtracting 654409 from its reverse (904456), we obtain a cube (250047 = 63³).

The spelling of 654409 in words is "six hundred fifty-four thousand, four hundred nine".