1280966401 has 16 divisors (see below), whose sum is σ = 1519539840. Its totient is φ = 1064488320.

The previous prime is 1280966399. The next prime is 1280966411. The reversal of 1280966401 is 1046690821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1280966401 - 2¹ = 1280966399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280966411) 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, 28756 + ... + 58213.

It is an arithmetic number, because the mean of its divisors is an integer number (94971240).

Almost surely, 2^1280966401 is an apocalyptic number.

1280966401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1280966401 is a deficient number, since it is larger than the sum of its proper divisors (238573439).

1280966401 is a wasteful number, since it uses less digits than its factorization.

1280966401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87096.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1280966401 is about 35790.5909562835. The cubic root of 1280966401 is about 1086.0402295545.

The spelling of 1280966401 in words is "one billion, two hundred eighty million, nine hundred sixty-six thousand, four hundred one".