655421140 has 48 divisors (see below), whose sum is σ = 1512383040. Its totient is φ = 236609280.

The previous prime is 655421113. The next prime is 655421159. The reversal of 655421140 is 41124556.

655421140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 655421099 and 655421108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19864 + ... + 41296.

It is an arithmetic number, because the mean of its divisors is an integer number (31507980).

Almost surely, 2^655421140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655421140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756191520).

655421140 is an abundant number, since it is smaller than the sum of its proper divisors (856961900).

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

655421140 is a wasteful number, since it uses less digits than its factorization.

655421140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21592 (or 21590 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 655421140 is about 25601.1941127753. The cubic root of 655421140 is about 868.6406481067.

Adding to 655421140 its reverse (41124556), we get a palindrome (696545696).

The spelling of 655421140 in words is "six hundred fifty-five million, four hundred twenty-one thousand, one hundred forty".