1256412538 has 8 divisors (see below), whose sum is σ = 1886069088. Its totient is φ = 627722844.

The previous prime is 1256412533. The next prime is 1256412581. The reversal of 1256412538 is 8352146521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1256412497 and 1256412506.

It is not an unprimeable number, because it can be changed into a prime (1256412533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 238456 + ... + 243667.

It is an arithmetic number, because the mean of its divisors is an integer number (235758636).

Almost surely, 2^1256412538 is an apocalyptic number.

1256412538 is a deficient number, since it is larger than the sum of its proper divisors (629656550).

1256412538 is a wasteful number, since it uses less digits than its factorization.

1256412538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483428.

The product of its digits is 57600, while the sum is 37.

The square root of 1256412538 is about 35445.9100320474. The cubic root of 1256412538 is about 1079.0562566099.

The spelling of 1256412538 in words is "one billion, two hundred fifty-six million, four hundred twelve thousand, five hundred thirty-eight".