1256564 has 12 divisors (see below), whose sum is σ = 2216004. Its totient is φ = 623424.

The previous prime is 1256543. The next prime is 1256573. The reversal of 1256564 is 4656521.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 708964 = 740^2 + 842^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam 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, 599 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (184667).

2^1256564 is an apocalyptic number.

It is an amenable number.

1256564 is a deficient number, since it is larger than the sum of its proper divisors (959440).

1256564 is a wasteful number, since it uses less digits than its factorization.

1256564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434 (or 2432 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 1256564 is about 1120.9656551385. The cubic root of 1256564 is about 107.9099615365.

The spelling of 1256564 in words is "one million, two hundred fifty-six thousand, five hundred sixty-four".