1272079405 has 16 divisors (see below), whose sum is σ = 1537150464. Its totient is φ = 1010580480.

The previous prime is 1272079399. The next prime is 1272079427. The reversal of 1272079405 is 5049702721.

It is not a de Polignac number, because 1272079405 - 2³ = 1272079397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878392 + ... + 879838.

It is an arithmetic number, because the mean of its divisors is an integer number (96071904).

Almost surely, 2^1272079405 is an apocalyptic number.

It is an amenable number.

1272079405 is a deficient number, since it is larger than the sum of its proper divisors (265071059).

1272079405 is a wasteful number, since it uses less digits than its factorization.

1272079405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 1272079405 is about 35666.2221857039. Note that the first 3 decimals coincide. The cubic root of 1272079405 is about 1083.5228484754.

The spelling of 1272079405 in words is "one billion, two hundred seventy-two million, seventy-nine thousand, four hundred five".