1256345723 has 4 divisors (see below), whose sum is σ = 1256419200. Its totient is φ = 1256272248.

The previous prime is 1256345719. The next prime is 1256345731. The reversal of 1256345723 is 3275436521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1256345723 - 2² = 1256345719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256345023) 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, 3878 + ... + 50276.

It is an arithmetic number, because the mean of its divisors is an integer number (314104800).

Almost surely, 2^1256345723 is an apocalyptic number.

1256345723 is a deficient number, since it is larger than the sum of its proper divisors (73477).

1256345723 is an equidigital number, since it uses as much as digits as its factorization.

1256345723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73476.

The product of its digits is 151200, while the sum is 38.

The square root of 1256345723 is about 35444.9675271399. The cubic root of 1256345723 is about 1079.0371284919.

The spelling of 1256345723 in words is "one billion, two hundred fifty-six million, three hundred forty-five thousand, seven hundred twenty-three".