643406126 has 12 divisors (see below), whose sum is σ = 1060822896. Its totient is φ = 292457220.

The previous prime is 643406111. The next prime is 643406149. The reversal of 643406126 is 621604346.

643406126 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643406092 and 643406101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1329110 + ... + 1329593.

It is an arithmetic number, because the mean of its divisors is an integer number (88401908).

Almost surely, 2^643406126 is an apocalyptic number.

643406126 is a deficient number, since it is larger than the sum of its proper divisors (417416770).

643406126 is a wasteful number, since it uses less digits than its factorization.

643406126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658727 (or 2658716 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 643406126 is about 25365.4514251176. The cubic root of 643406126 is about 863.2999793650.

The spelling of 643406126 in words is "six hundred forty-three million, four hundred six thousand, one hundred twenty-six".