1280449252 has 12 divisors (see below), whose sum is σ = 2243014060. Its totient is φ = 639588096.

The previous prime is 1280449243. The next prime is 1280449259. The reversal of 1280449252 is 2529440821.

It can be written as a sum of positive squares in 2 ways, for example, as 369254656 + 911194596 = 19216^2 + 30186^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1280449259) 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, 154593 + ... + 162664.

Almost surely, 2^1280449252 is an apocalyptic number.

It is an amenable number.

1280449252 is a deficient number, since it is larger than the sum of its proper divisors (962564808).

1280449252 is a wasteful number, since it uses less digits than its factorization.

1280449252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318270 (or 318268 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1280449252 is about 35783.3655767593. The cubic root of 1280449252 is about 1085.8940586071.

The spelling of 1280449252 in words is "one billion, two hundred eighty million, four hundred forty-nine thousand, two hundred fifty-two".