653240 has 32 divisors (see below), whose sum is σ = 1680480. Its totient is φ = 223872.

The previous prime is 653209. The next prime is 653243. The reversal of 653240 is 42356.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 653240.

It is not an unprimeable number, because it can be changed into a prime (653243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887 + ... + 1446.

It is an arithmetic number, because the mean of its divisors is an integer number (52515).

2⁶⁵³²⁴⁰ is an apocalyptic number.

It is an amenable number.

653240 is an abundant number, since it is smaller than the sum of its proper divisors (1027240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

653240 is a wasteful number, since it uses less digits than its factorization.

653240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 653240 is about 808.2326397764. The cubic root of 653240 is about 86.7676010097.

Adding to 653240 its reverse (42356), we get a palindrome (695596).

The spelling of 653240 in words is "six hundred fifty-three thousand, two hundred forty".