1256883139 has 8 divisors (see below), whose sum is σ = 1313817120. Its totient is φ = 1200139776.

The previous prime is 1256883137. The next prime is 1256883143. The reversal of 1256883139 is 9313886521.

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

It is a cyclic number.

It is not a de Polignac number, because 1256883139 - 2¹ = 1256883137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256883137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34084 + ... + 60625.

It is an arithmetic number, because the mean of its divisors is an integer number (164227140).

Almost surely, 2^1256883139 is an apocalyptic number.

1256883139 is a deficient number, since it is larger than the sum of its proper divisors (56933981).

1256883139 is an equidigital number, since it uses as much as digits as its factorization.

1256883139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95309.

The product of its digits is 311040, while the sum is 46.

The square root of 1256883139 is about 35452.5477081690. The cubic root of 1256883139 is about 1079.1909633113.

The spelling of 1256883139 in words is "one billion, two hundred fifty-six million, eight hundred eighty-three thousand, one hundred thirty-nine".