1256545 has 8 divisors (see below), whose sum is σ = 1540224. Its totient is φ = 983664.

The previous prime is 1256543. The next prime is 1256573. The reversal of 1256545 is 5456521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256545 - 2¹ = 1256543 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256543) 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, 2439 + ... + 2908.

It is an arithmetic number, because the mean of its divisors is an integer number (192528).

2^1256545 is an apocalyptic number.

It is an amenable number.

1256545 is a deficient number, since it is larger than the sum of its proper divisors (283679).

1256545 is an equidigital number, since it uses as much as digits as its factorization.

1256545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399.

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

The square root of 1256545 is about 1120.9571802705. The cubic root of 1256545 is about 107.9094176460.

It can be divided in two parts, 125 and 6545, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 1256545 in words is "one million, two hundred fifty-six thousand, five hundred forty-five".