1280440497 has 32 divisors (see below), whose sum is σ = 1971302400. Its totient is φ = 724157568.

The previous prime is 1280440477. The next prime is 1280440531. The reversal of 1280440497 is 7940440821.

It is not a de Polignac number, because 1280440497 - 2⁶ = 1280440433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280440477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1780504 + ... + 1781222.

It is an arithmetic number, because the mean of its divisors is an integer number (61603200).

Almost surely, 2^1280440497 is an apocalyptic number.

It is an amenable number.

1280440497 is a deficient number, since it is larger than the sum of its proper divisors (690861903).

1280440497 is a wasteful number, since it uses less digits than its factorization.

1280440497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1280440497 is about 35783.2432431718. The cubic root of 1280440497 is about 1085.8915836882.

It can be divided in two parts, 12804 and 40497, that added together give a triangular number (53301 = T₃₂₆).

The spelling of 1280440497 in words is "one billion, two hundred eighty million, four hundred forty thousand, four hundred ninety-seven".