1256405675 has 12 divisors (see below), whose sum is σ = 1780506576. Its totient is φ = 861535200.

The previous prime is 1256405573. The next prime is 1256405687. The reversal of 1256405675 is 5765046521.

It is not a de Polignac number, because 1256405675 - 2¹⁰ = 1256404651 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3589556 + ... + 3589905.

It is an arithmetic number, because the mean of its divisors is an integer number (148375548).

Almost surely, 2^1256405675 is an apocalyptic number.

1256405675 is a deficient number, since it is larger than the sum of its proper divisors (524100901).

1256405675 is an equidigital number, since it uses as much as digits as its factorization.

1256405675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7179478 (or 7179473 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 41.

The square root of 1256405675 is about 35445.8132224386. The cubic root of 1256405675 is about 1079.0542918687.

The spelling of 1256405675 in words is "one billion, two hundred fifty-six million, four hundred five thousand, six hundred seventy-five".