1255616 has 28 divisors (see below), whose sum is σ = 2602992. Its totient is φ = 599808.

The previous prime is 1255609. The next prime is 1255619. The reversal of 1255616 is 6165521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255619) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1046 + ... + 1898.

It is an arithmetic number, because the mean of its divisors is an integer number (92964).

2^1255616 is an apocalyptic number.

1255616 is a gapful number since it is divisible by the number (16) 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 1255616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1301496).

1255616 is an abundant number, since it is smaller than the sum of its proper divisors (1347376).

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

1255616 is an equidigital number, since it uses as much as digits as its factorization.

1255616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 878 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 1255616 is about 1120.5427256468. The cubic root of 1255616 is about 107.8828175735.

The spelling of 1255616 in words is "one million, two hundred fifty-five thousand, six hundred sixteen".