1256520 has 64 divisors (see below), whose sum is σ = 3885120. Its totient is φ = 324864.

The previous prime is 1256477. The next prime is 1256531. The reversal of 1256520 is 256521.

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, 4299 + ... + 4581.

It is an arithmetic number, because the mean of its divisors is an integer number (60705).

2^1256520 is an apocalyptic number.

1256520 is a gapful number since it is divisible by the number (10) 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 1256520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1942560).

1256520 is an abundant number, since it is smaller than the sum of its proper divisors (2628600).

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

1256520 is a wasteful number, since it uses less digits than its factorization.

1256520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 330 counting only the distinct ones).

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

The square root of 1256520 is about 1120.9460290308. The cubic root of 1256520 is about 107.9087019923.

Subtracting from 1256520 its reverse (256521), we obtain a palindrome (999999).

The spelling of 1256520 in words is "one million, two hundred fifty-six thousand, five hundred twenty".