655240 has 16 divisors (see below), whose sum is σ = 1474380. Its totient is φ = 262080.

The previous prime is 655229. The next prime is 655241. The reversal of 655240 is 42556.

It can be written as a sum of positive squares in 2 ways, for example, as 527076 + 128164 = 726^2 + 358^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (655241) 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, 8151 + ... + 8230.

2⁶⁵⁵²⁴⁰ is an apocalyptic number.

It is an amenable number.

655240 is an abundant number, since it is smaller than the sum of its proper divisors (819140).

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

655240 is a wasteful number, since it uses less digits than its factorization.

655240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16392 (or 16388 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 655240 is about 809.4689617274. The cubic root of 655240 is about 86.8560618105.

Adding to 655240 its reverse (42556), we get a palindrome (697796).

The spelling of 655240 in words is "six hundred fifty-five thousand, two hundred forty".