1256838 has 32 divisors (see below), whose sum is σ = 2782080. Its totient is φ = 375360.

The previous prime is 1256837. The next prime is 1256863. The reversal of 1256838 is 8386521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1256799 and 1256808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8973 + ... + 9111.

It is an arithmetic number, because the mean of its divisors is an integer number (86940).

2^1256838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391040).

1256838 is an abundant number, since it is smaller than the sum of its proper divisors (1525242).

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

1256838 is a wasteful number, since it uses less digits than its factorization.

1256838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its digits is 11520, while the sum is 33.

The square root of 1256838 is about 1121.0878645316. The cubic root of 1256838 is about 107.9178044002.

The spelling of 1256838 in words is "one million, two hundred fifty-six thousand, eight hundred thirty-eight".