655745 has 4 divisors (see below), whose sum is σ = 786900. Its totient is φ = 524592.

The previous prime is 655727. The next prime is 655757. The reversal of 655745 is 547556.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 368449 + 287296 = 607^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 655745 - 2⁸ = 655489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65570 + ... + 65579.

It is an arithmetic number, because the mean of its divisors is an integer number (196725).

2⁶⁵⁵⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

655745 is a deficient number, since it is larger than the sum of its proper divisors (131155).

655745 is a wasteful number, since it uses less digits than its factorization.

655745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131154.

The product of its digits is 21000, while the sum is 32.

The square root of 655745 is about 809.7808345472. The cubic root of 655745 is about 86.8783696914.

The spelling of 655745 in words is "six hundred fifty-five thousand, seven hundred forty-five".