1280197992 has 16 divisors (see below), whose sum is σ = 3200495040. Its totient is φ = 426732656.

The previous prime is 1280197967. The next prime is 1280197993. The reversal of 1280197992 is 2997910821.

It is not an unprimeable number, because it can be changed into a prime (1280197993) 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, 26670768 + ... + 26670815.

It is an arithmetic number, because the mean of its divisors is an integer number (200030940).

Almost surely, 2^1280197992 is an apocalyptic number.

1280197992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1280197992 is an abundant number, since it is smaller than the sum of its proper divisors (1920297048).

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

1280197992 is a wasteful number, since it uses less digits than its factorization.

1280197992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53341592 (or 53341588 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 1280197992 is about 35779.8545553220. The cubic root of 1280197992 is about 1085.8230263531.

The spelling of 1280197992 in words is "one billion, two hundred eighty million, one hundred ninety-seven thousand, nine hundred ninety-two".