1256881362 has 16 divisors (see below), whose sum is σ = 2742286752. Its totient is φ = 380873120.

The previous prime is 1256881361. The next prime is 1256881387. The reversal of 1256881362 is 2631886521.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1256881361) 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 7 ways as a sum of consecutive naturals, for example, 9521763 + ... + 9521894.

It is an arithmetic number, because the mean of its divisors is an integer number (171392922).

Almost surely, 2^1256881362 is an apocalyptic number.

1256881362 is an abundant number, since it is smaller than the sum of its proper divisors (1485405390).

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

1256881362 is a wasteful number, since it uses less digits than its factorization.

1256881362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19043673.

The product of its digits is 138240, while the sum is 42.

The square root of 1256881362 is about 35452.5226464916. The cubic root of 1256881362 is about 1079.1904547190.

The spelling of 1256881362 in words is "one billion, two hundred fifty-six million, eight hundred eighty-one thousand, three hundred sixty-two".