1272001408 has 16 divisors (see below), whose sum is σ = 2534065560. Its totient is φ = 636000640.

The previous prime is 1272001403. The next prime is 1272001469. The reversal of 1272001408 is 8041002721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272001403) 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 as a sum of consecutive naturals, namely, 4968628 + ... + 4968883.

Almost surely, 2^1272001408 is an apocalyptic number.

It is an amenable number.

1272001408 is a deficient number, since it is larger than the sum of its proper divisors (1262064152).

1272001408 is an frugal number, since it uses more digits than its factorization.

1272001408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9937525 (or 9937513 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 1272001408 is about 35665.1287394284. The cubic root of 1272001408 is about 1083.5007027774.

The spelling of 1272001408 in words is "one billion, two hundred seventy-two million, one thousand, four hundred eight".