126687905 has 4 divisors (see below), whose sum is σ = 152025492. Its totient is φ = 101350320.

The previous prime is 126687857. The next prime is 126687929. The reversal of 126687905 is 509786621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509786621 = 29 ⋅17578849.

It can be written as a sum of positive squares in 2 ways, for example, as 56010256 + 70677649 = 7484^2 + 8407^2 .

It is not a de Polignac number, because 126687905 - 2¹⁴ = 126671521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 12668786 + ... + 12668795.

It is an arithmetic number, because the mean of its divisors is an integer number (38006373).

Almost surely, 2^126687905 is an apocalyptic number.

It is an amenable number.

126687905 is a deficient number, since it is larger than the sum of its proper divisors (25337587).

126687905 is an equidigital number, since it uses as much as digits as its factorization.

126687905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25337586.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 126687905 is about 11255.5721755937. The cubic root of 126687905 is about 502.2404854542.

The spelling of 126687905 in words is "one hundred twenty-six million, six hundred eighty-seven thousand, nine hundred five".