653909 has 6 divisors (see below), whose sum is σ = 671970. Its totient is φ = 636320.

The previous prime is 653903. The next prime is 653927. The reversal of 653909 is 909356.

It can be written as a sum of positive squares in 3 ways, for example, as 61009 + 592900 = 247^2 + 770^2 .

It is not a de Polignac number, because 653909 - 2⁴ = 653893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653909.

It is not an unprimeable number, because it can be changed into a prime (653903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1487 + ... + 1875.

It is an arithmetic number, because the mean of its divisors is an integer number (111995).

2⁶⁵³⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

653909 is a deficient number, since it is larger than the sum of its proper divisors (18061).

653909 is an equidigital number, since it uses as much as digits as its factorization.

653909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 653909 is about 808.6463998560. The cubic root of 653909 is about 86.7972112195.

The spelling of 653909 in words is "six hundred fifty-three thousand, nine hundred nine".