1295256387 has 4 divisors (see below), whose sum is σ = 1727008520. Its totient is φ = 863504256.

The previous prime is 1295256383. The next prime is 1295256419. The reversal of 1295256387 is 7836525921.

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

It is not a de Polignac number, because 1295256387 - 2² = 1295256383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1295256383) 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 3 ways as a sum of consecutive naturals, for example, 215876062 + ... + 215876067.

It is an arithmetic number, because the mean of its divisors is an integer number (431752130).

Almost surely, 2^1295256387 is an apocalyptic number.

1295256387 is a deficient number, since it is larger than the sum of its proper divisors (431752133).

1295256387 is an equidigital number, since it uses as much as digits as its factorization.

1295256387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431752132.

The product of its digits is 907200, while the sum is 48.

The square root of 1295256387 is about 35989.6705597592. The cubic root of 1295256387 is about 1090.0637919627.

The spelling of 1295256387 in words is "one billion, two hundred ninety-five million, two hundred fifty-six thousand, three hundred eighty-seven".