1277080538 has 4 divisors (see below), whose sum is σ = 1915620810. Its totient is φ = 638540268.

The previous prime is 1277080531. The next prime is 1277080549. The reversal of 1277080538 is 8350807721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8350807721 = 5827 ⋅1433123.

It can be written as a sum of positive squares in only one way, i.e., 1072104049 + 204976489 = 32743^2 + 14317^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1277080495 and 1277080504.

It is not an unprimeable number, because it can be changed into a prime (1277080531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319270133 + ... + 319270136.

Almost surely, 2^1277080538 is an apocalyptic number.

1277080538 is a deficient number, since it is larger than the sum of its proper divisors (638540272).

1277080538 is an equidigital number, since it uses as much as digits as its factorization.

1277080538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638540271.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 1277080538 is about 35736.2636267420. The cubic root of 1277080538 is about 1084.9409350081.

The spelling of 1277080538 in words is "one billion, two hundred seventy-seven million, eighty thousand, five hundred thirty-eight".