126436563 has 12 divisors (see below), whose sum is σ = 199233528. Its totient is φ = 76628160.

The previous prime is 126436559. The next prime is 126436573. The reversal of 126436563 is 365634621.

126436563 is a `hidden beast` number, since 1 + 2 + 64 + 36 + 563 = 666.

It is not a de Polignac number, because 126436563 - 2² = 126436559 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (126436573) 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 in 11 ways as a sum of consecutive naturals, for example, 638470 + ... + 638667.

It is an arithmetic number, because the mean of its divisors is an integer number (16602794).

Almost surely, 2^126436563 is an apocalyptic number.

126436563 is a deficient number, since it is larger than the sum of its proper divisors (72796965).

126436563 is a wasteful number, since it uses less digits than its factorization.

126436563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277154 (or 1277151 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 126436563 is about 11244.4014069225. The cubic root of 126436563 is about 501.9081261791.

The spelling of 126436563 in words is "one hundred twenty-six million, four hundred thirty-six thousand, five hundred sixty-three".