1280440506 has 16 divisors (see below), whose sum is σ = 2573882784. Its totient is φ = 424646544.

The previous prime is 1280440477. The next prime is 1280440531. The reversal of 1280440506 is 6050440821.

1280440506 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540460 + ... + 542823.

It is an arithmetic number, because the mean of its divisors is an integer number (160867674).

Almost surely, 2^1280440506 is an apocalyptic number.

1280440506 is an abundant number, since it is smaller than the sum of its proper divisors (1293442278).

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

1280440506 is a wasteful number, since it uses less digits than its factorization.

1280440506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083485.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 1280440506 is about 35783.2433689290. The cubic root of 1280440506 is about 1085.8915862323.

The spelling of 1280440506 in words is "one billion, two hundred eighty million, four hundred forty thousand, five hundred six".