1256841 has 12 divisors (see below), whose sum is σ = 1841268. Its totient is φ = 825984.

The previous prime is 1256837. The next prime is 1256863. The reversal of 1256841 is 1486521.

It can be written as a sum of positive squares in 2 ways, for example, as 921600 + 335241 = 960^2 + 579^2 .

It is not a de Polignac number, because 1256841 - 2² = 1256837 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

1256841 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1256821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (153439).

2^1256841 is an apocalyptic number.

It is an amenable number.

1256841 is a deficient number, since it is larger than the sum of its proper divisors (584427).

1256841 is a wasteful number, since it uses less digits than its factorization.

1256841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 1989 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1256841 is about 1121.0892025169. The cubic root of 1256841 is about 107.9178902647.

The spelling of 1256841 in words is "one million, two hundred fifty-six thousand, eight hundred forty-one".