1256653 has 4 divisors (see below), whose sum is σ = 1272640. Its totient is φ = 1240668.

The previous prime is 1256621. The next prime is 1256659. The reversal of 1256653 is 3566521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1256653 - 2⁵ = 1256621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7875 + ... + 8032.

It is an arithmetic number, because the mean of its divisors is an integer number (318160).

2^1256653 is an apocalyptic number.

It is an amenable number.

1256653 is a deficient number, since it is larger than the sum of its proper divisors (15987).

1256653 is an equidigital number, since it uses as much as digits as its factorization.

1256653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15986.

The product of its digits is 5400, while the sum is 28.

The square root of 1256653 is about 1121.0053523512. The cubic root of 1256653 is about 107.9125091611.

It can be divided in two parts, 12 and 56653, that added together give a palindrome (56665).

The spelling of 1256653 in words is "one million, two hundred fifty-six thousand, six hundred fifty-three".