1278256892 has 12 divisors (see below), whose sum is σ = 2440308696. Its totient is φ = 581025840.

The previous prime is 1278256879. The next prime is 1278256897. The reversal of 1278256892 is 2986528721.

It is a self number, because there is not a number n which added to its sum of digits gives 1278256892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278256897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14525603 + ... + 14525690.

It is an arithmetic number, because the mean of its divisors is an integer number (203359058).

Almost surely, 2^1278256892 is an apocalyptic number.

It is an amenable number.

1278256892 is a deficient number, since it is larger than the sum of its proper divisors (1162051804).

1278256892 is a wasteful number, since it uses less digits than its factorization.

1278256892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29051308 (or 29051306 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 1278256892 is about 35752.7186658581. The cubic root of 1278256892 is about 1085.2739557536.

The spelling of 1278256892 in words is "one billion, two hundred seventy-eight million, two hundred fifty-six thousand, eight hundred ninety-two".