654240 has 96 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 164864.

The previous prime is 654233. The next prime is 654257. The reversal of 654240 is 42456.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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 654240.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13897 + ... + 13943.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2⁶⁵⁴²⁴⁰ is an apocalyptic number.

654240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

654240 is an abundant number, since it is smaller than the sum of its proper divisors (1523040).

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

654240 is a wasteful number, since it uses less digits than its factorization.

654240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 654240 is about 808.8510369654. The cubic root of 654240 is about 86.8118539454.

Adding to 654240 its reverse (42456), we get a palindrome (696696).

The spelling of 654240 in words is "six hundred fifty-four thousand, two hundred forty".