1255520 has 96 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 400896.

The previous prime is 1255519. The next prime is 1255549. The reversal of 1255520 is 255521.

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

It is a junction number, because it is equal to n+sod(n) for n = 1255492 and 1255501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21251 + ... + 21309.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2^1255520 is an apocalyptic number.

1255520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1120×1121.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814400).

1255520 is an abundant number, since it is smaller than the sum of its proper divisors (2373280).

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

1255520 is a wasteful number, since it uses less digits than its factorization.

1255520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 1255520 is about 1120.4998884427. The cubic root of 1255520 is about 107.8800680560.

Subtracting from 1255520 its reverse (255521), we obtain a palindrome (999999).

The spelling of 1255520 in words is "one million, two hundred fifty-five thousand, five hundred twenty".