1272904769 has 2 divisors, whose sum is σ = 1272904770. Its totient is φ = 1272904768.

The previous prime is 1272904757. The next prime is 1272904777. The reversal of 1272904769 is 9674092721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1094815744 + 178089025 = 33088^2 + 13345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272904769 - 2⁸ = 1272904513 is a prime.

It is a super-2 number, since 2×1272904769² = 3240573101885886722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1272904469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636452384 + 636452385.

It is an arithmetic number, because the mean of its divisors is an integer number (636452385).

Almost surely, 2^1272904769 is an apocalyptic number.

It is an amenable number.

1272904769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272904769 is an equidigital number, since it uses as much as digits as its factorization.

1272904769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 1272904769 is about 35677.7909770210. The cubic root of 1272904769 is about 1083.7571387254.

The spelling of 1272904769 in words is "one billion, two hundred seventy-two million, nine hundred four thousand, seven hundred sixty-nine".