655400 has 48 divisors (see below), whose sum is σ = 1590300. Its totient is φ = 250880.

The previous prime is 655399. The next prime is 655439. The reversal of 655400 is 4556.

It can be written as a sum of positive squares in 6 ways, for example, as 68644 + 586756 = 262^2 + 766^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5744 + ... + 5856.

2⁶⁵⁵⁴⁰⁰ 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 655400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795150).

655400 is an abundant number, since it is smaller than the sum of its proper divisors (934900).

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

655400 is a wasteful number, since it uses less digits than its factorization.

655400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 655400 is about 809.5677859204. The cubic root of 655400 is about 86.8631308941.

Adding to 655400 its reverse (4556), we get a palindrome (659956).

The spelling of 655400 in words is "six hundred fifty-five thousand, four hundred".