655988393 has 4 divisors (see below), whose sum is σ = 656042880. Its totient is φ = 655933908.

The previous prime is 655988387. The next prime is 655988413. The reversal of 655988393 is 393889556.

655988393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 655988393 - 2⁶ = 655988329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655988363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305 + ... + 36222.

It is an arithmetic number, because the mean of its divisors is an integer number (164010720).

Almost surely, 2^655988393 is an apocalyptic number.

It is an amenable number.

655988393 is a deficient number, since it is larger than the sum of its proper divisors (54487).

655988393 is a wasteful number, since it uses less digits than its factorization.

655988393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54486.

The product of its digits is 6998400, while the sum is 56.

The square root of 655988393 is about 25612.2703601223. The cubic root of 655988393 is about 868.8911724897.

The spelling of 655988393 in words is "six hundred fifty-five million, nine hundred eighty-eight thousand, three hundred ninety-three".