1280429969 has 16 divisors (see below), whose sum is σ = 1658858880. Its totient is φ = 959765760.

The previous prime is 1280429947. The next prime is 1280430013. The reversal of 1280429969 is 9699240821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1280429969 - 2¹⁶ = 1280364433 is a prime.

It is a super-2 number, since 2×1280429969² = 3279001811026681922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1280429939) 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, 368552 + ... + 372009.

It is an arithmetic number, because the mean of its divisors is an integer number (103678680).

Almost surely, 2^1280429969 is an apocalyptic number.

1280429969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1280429969 is a deficient number, since it is larger than the sum of its proper divisors (378428911).

1280429969 is a wasteful number, since it uses less digits than its factorization.

1280429969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740600.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 1280429969 is about 35783.0961349071. The cubic root of 1280429969 is about 1085.8886075514. Note that the first 3 decimals are identical.

The spelling of 1280429969 in words is "one billion, two hundred eighty million, four hundred twenty-nine thousand, nine hundred sixty-nine".