1280406867 has 16 divisors (see below), whose sum is σ = 1856490912. Its totient is φ = 781678080.

The previous prime is 1280406863. The next prime is 1280406877. The reversal of 1280406867 is 7686040821.

It is not a de Polignac number, because 1280406867 - 2² = 1280406863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280406863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337384 + ... + 341157.

It is an arithmetic number, because the mean of its divisors is an integer number (116030682).

Almost surely, 2^1280406867 is an apocalyptic number.

1280406867 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1280406867 is a deficient number, since it is larger than the sum of its proper divisors (576084045).

1280406867 is a wasteful number, since it uses less digits than its factorization.

1280406867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678598.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 1280406867 is about 35782.7733273988. The cubic root of 1280406867 is about 1085.8820768417.

The spelling of 1280406867 in words is "one billion, two hundred eighty million, four hundred six thousand, eight hundred sixty-seven".