1256816 has 40 divisors (see below), whose sum is σ = 2742384. Its totient is φ = 552960.

The previous prime is 1256813. The next prime is 1256819. The reversal of 1256816 is 6186521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1256813) and next prime (1256819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6416 + ... + 6608.

2^1256816 is an apocalyptic number.

1256816 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 1256816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371192).

1256816 is an abundant number, since it is smaller than the sum of its proper divisors (1485568).

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

1256816 is a wasteful number, since it uses less digits than its factorization.

1256816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 243 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1256816 is about 1121.0780525905. The cubic root of 1256816 is about 107.9171747234.

The spelling of 1256816 in words is "one million, two hundred fifty-six thousand, eight hundred sixteen".