1256748042 has 16 divisors (see below), whose sum is σ = 2741995872. Its totient is φ = 380832720.

The previous prime is 1256748041. The next prime is 1256748049. The reversal of 1256748042 is 2408476521.

It is not an unprimeable number, because it can be changed into a prime (1256748041) 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 7 ways as a sum of consecutive naturals, for example, 9520753 + ... + 9520884.

It is an arithmetic number, because the mean of its divisors is an integer number (171374742).

Almost surely, 2^1256748042 is an apocalyptic number.

1256748042 is an abundant number, since it is smaller than the sum of its proper divisors (1485247830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256748042 is a wasteful number, since it uses less digits than its factorization.

1256748042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19041653.

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 1256748042 is about 35450.6423355064. The cubic root of 1256748042 is about 1079.1522960502.

The spelling of 1256748042 in words is "one billion, two hundred fifty-six million, seven hundred forty-eight thousand, forty-two".