1256730723 has 12 divisors (see below), whose sum is σ = 1845037168. Its totient is φ = 824085360.

The previous prime is 1256730691. The next prime is 1256730757. The reversal of 1256730723 is 3270376521.

It is not a de Polignac number, because 1256730723 - 2⁵ = 1256730691 is a prime.

It is a super-2 number, since 2×1256730723² = 3158744220264205458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256730523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1144015 + ... + 1145112.

Almost surely, 2^1256730723 is an apocalyptic number.

1256730723 is a deficient number, since it is larger than the sum of its proper divisors (588306445).

1256730723 is a wasteful number, since it uses less digits than its factorization.

1256730723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289194 (or 2289191 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 1256730723 is about 35450.3980654661. The cubic root of 1256730723 is about 1079.1473388315.

The spelling of 1256730723 in words is "one billion, two hundred fifty-six million, seven hundred thirty thousand, seven hundred twenty-three".