1256723 has 4 divisors (see below), whose sum is σ = 1353408. Its totient is φ = 1160040.

The previous prime is 1256711. The next prime is 1256729. The reversal of 1256723 is 3276521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1256723 - 2⁴ = 1256707 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256692 and 1256701.

It is not an unprimeable number, because it can be changed into a prime (1256729) 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, 48323 + ... + 48348.

It is an arithmetic number, because the mean of its divisors is an integer number (338352).

2^1256723 is an apocalyptic number.

1256723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1256723 is a deficient number, since it is larger than the sum of its proper divisors (96685).

1256723 is an equidigital number, since it uses as much as digits as its factorization.

1256723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96684.

The product of its digits is 2520, while the sum is 26.

The square root of 1256723 is about 1121.0365738904. The cubic root of 1256723 is about 107.9145128262.

The spelling of 1256723 in words is "one million, two hundred fifty-six thousand, seven hundred twenty-three".