655397399 has 4 divisors (see below), whose sum is σ = 655982136. Its totient is φ = 654812664.

The previous prime is 655397333. The next prime is 655397453. The reversal of 655397399 is 993793556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655397399 - 2⁸ = 655397143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655399399) 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, 290684 + ... + 292929.

It is an arithmetic number, because the mean of its divisors is an integer number (163995534).

Almost surely, 2^655397399 is an apocalyptic number.

655397399 is a deficient number, since it is larger than the sum of its proper divisors (584737).

655397399 is a wasteful number, since it uses less digits than its factorization.

655397399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584736.

The product of its digits is 6889050, while the sum is 56.

The square root of 655397399 is about 25600.7304387980. The cubic root of 655397399 is about 868.6301598646.

The spelling of 655397399 in words is "six hundred fifty-five million, three hundred ninety-seven thousand, three hundred ninety-nine".