1256455 has 4 divisors (see below), whose sum is σ = 1507752. Its totient is φ = 1005160.

The previous prime is 1256449. The next prime is 1256477. The reversal of 1256455 is 5546521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5546521 = 41 ⋅135281.

It is not a de Polignac number, because 1256455 - 2¹⁵ = 1223687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125641 + ... + 125650.

It is an arithmetic number, because the mean of its divisors is an integer number (376938).

2^1256455 is an apocalyptic number.

1256455 is a deficient number, since it is larger than the sum of its proper divisors (251297).

1256455 is an equidigital number, since it uses as much as digits as its factorization.

1256455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251296.

The product of its digits is 6000, while the sum is 28.

The square root of 1256455 is about 1120.9170352885. The cubic root of 1256455 is about 107.9068412482.

It can be divided in two parts, 1256 and 455, that added together give a triangular number (1711 = T₅₈).

The spelling of 1256455 in words is "one million, two hundred fifty-six thousand, four hundred fifty-five".