1280766406 has 4 divisors (see below), whose sum is σ = 1921149612. Its totient is φ = 640383202.

The previous prime is 1280766391. The next prime is 1280766419. The reversal of 1280766406 is 6046670821.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320191600 + ... + 320191603.

It is an arithmetic number, because the mean of its divisors is an integer number (480287403).

Almost surely, 2^1280766406 is an apocalyptic number.

1280766406 is a deficient number, since it is larger than the sum of its proper divisors (640383206).

1280766406 is an equidigital number, since it uses as much as digits as its factorization.

1280766406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640383205.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1280766406 is about 35787.7968866484. The cubic root of 1280766406 is about 1085.9837061047.

The spelling of 1280766406 in words is "one billion, two hundred eighty million, seven hundred sixty-six thousand, four hundred six".