655000 has 40 divisors (see below), whose sum is σ = 1546380. Its totient is φ = 260000.

The previous prime is 654991. The next prime is 655001. The reversal of 655000 is 556.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4935 + ... + 5065.

2⁶⁵⁵⁰⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773190).

655000 is an abundant number, since it is smaller than the sum of its proper divisors (891380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655000 is a wasteful number, since it uses less digits than its factorization.

655000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 655000 is about 809.3207028119. The cubic root of 655000 is about 86.8454560272.

Adding to 655000 its reverse (556), we get a palindrome (655556).

The spelling of 655000 in words is "six hundred fifty-five thousand".