1255820 has 12 divisors (see below), whose sum is σ = 2637264. Its totient is φ = 502320.

The previous prime is 1255811. The next prime is 1255829. The reversal of 1255820 is 285521.

It is an interprime number because it is at equal distance from previous prime (1255811) and next prime (1255829).

It is not an unprimeable number, because it can be changed into a prime (1255829) 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, 31376 + ... + 31415.

It is an arithmetic number, because the mean of its divisors is an integer number (219772).

2^1255820 is an apocalyptic number.

1255820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255820 is an abundant number, since it is smaller than the sum of its proper divisors (1381444).

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

1255820 is a wasteful number, since it uses less digits than its factorization.

1255820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62800 (or 62798 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1255820 is about 1120.6337492687. The cubic root of 1255820 is about 107.8886598329. Note that the first 3 decimals are identical.

Subtracting from 1255820 its reverse (285521), we obtain a cube (970299 = 99³).

The spelling of 1255820 in words is "one million, two hundred fifty-five thousand, eight hundred twenty".