655140 has 48 divisors (see below), whose sum is σ = 1874880. Its totient is φ = 170880.

The previous prime is 655121. The next prime is 655157. The reversal of 655140 is 41556.

655140 = T₁₁₅ + T₁₁₆ + ... + T₁₇₅.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3571 + ... + 3749.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2⁶⁵⁵¹⁴⁰ is an apocalyptic number.

655140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937440).

655140 is an abundant number, since it is smaller than the sum of its proper divisors (1219740).

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

655140 is a wasteful number, since it uses less digits than its factorization.

655140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 655140 is about 809.4071904796. The cubic root of 655140 is about 86.8516430489.

Adding to 655140 its reverse (41556), we get a palindrome (696696).

The spelling of 655140 in words is "six hundred fifty-five thousand, one hundred forty".