655939 has 4 divisors (see below), whose sum is σ = 657720. Its totient is φ = 654160.

The previous prime is 655927. The next prime is 655943. The reversal of 655939 is 939556.

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 655939 - 2¹³ = 647747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655898 and 655907.

It is not an unprimeable number, because it can be changed into a prime (655909) 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, 109 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (164430).

2⁶⁵⁵⁹³⁹ is an apocalyptic number.

655939 is a deficient number, since it is larger than the sum of its proper divisors (1781).

655939 is a wasteful number, since it uses less digits than its factorization.

655939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780.

The product of its digits is 36450, while the sum is 37.

The square root of 655939 is about 809.9006111863. The cubic root of 655939 is about 86.8869364066.

It can be divided in two parts, 6 and 55939, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 655939 in words is "six hundred fifty-five thousand, nine hundred thirty-nine".