655945 has 8 divisors (see below), whose sum is σ = 833544. Its totient is φ = 493824.

The previous prime is 655943. The next prime is 655961. The reversal of 655945 is 549556.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 131769 + 524176 = 363^2 + 724^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655945 - 2¹ = 655943 is a prime.

655945 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 655945.

It is not an unprimeable number, because it can be changed into a prime (655943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3774 + ... + 3943.

It is an arithmetic number, because the mean of its divisors is an integer number (104193).

2⁶⁵⁵⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

655945 is a deficient number, since it is larger than the sum of its proper divisors (177599).

655945 is a wasteful number, since it uses less digits than its factorization.

655945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7739.

The product of its digits is 27000, while the sum is 34.

The square root of 655945 is about 809.9043153361. The cubic root of 655945 is about 86.8872013296.

It can be divided in two parts, 655 and 945, that added together give a square (1600 = 40²).

The spelling of 655945 in words is "six hundred fifty-five thousand, nine hundred forty-five".