1256440027 has 4 divisors (see below), whose sum is σ = 1256574880. Its totient is φ = 1256305176.

The previous prime is 1256440001. The next prime is 1256440099. The reversal of 1256440027 is 7200446521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7200446521 = 8123 ⋅886427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256440027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256449027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52323 + ... + 72460.

It is an arithmetic number, because the mean of its divisors is an integer number (314143720).

Almost surely, 2^1256440027 is an apocalyptic number.

1256440027 is a deficient number, since it is larger than the sum of its proper divisors (134853).

1256440027 is a wasteful number, since it uses less digits than its factorization.

1256440027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134852.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 1256440027 is about 35446.2977897551. The cubic root of 1256440027 is about 1079.0641260955.

Adding to 1256440027 its reverse (7200446521), we get a palindrome (8456886548).

The spelling of 1256440027 in words is "one billion, two hundred fifty-six million, four hundred forty thousand, twenty-seven".