1256456 has 8 divisors (see below), whose sum is σ = 2355870. Its totient is φ = 628224.

The previous prime is 1256449. The next prime is 1256477. The reversal of 1256456 is 6546521.

It can be written as a sum of positive squares in only one way, i.e., 1144900 + 111556 = 1070^2 + 334^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78521 + ... + 78536.

2^1256456 is an apocalyptic number.

It is an amenable number.

1256456 is a deficient number, since it is larger than the sum of its proper divisors (1099414).

1256456 is a wasteful number, since it uses less digits than its factorization.

1256456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157063 (or 157059 counting only the distinct ones).

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

The square root of 1256456 is about 1120.9174813518. The cubic root of 1256456 is about 107.9068698755.

The spelling of 1256456 in words is "one million, two hundred fifty-six thousand, four hundred fifty-six".