126838406639 has 16 divisors (see below), whose sum is σ = 148802304000. Its totient is φ = 108067575672.

The previous prime is 126838406573. The next prime is 126838406657. The reversal of 126838406639 is 936604838621.

It is a happy number.

It is not a de Polignac number, because 126838406639 - 2²⁴ = 126821629423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126838406689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1049879 + ... + 1164440.

It is an arithmetic number, because the mean of its divisors is an integer number (9300144000).

Almost surely, 2^126838406639 is an apocalyptic number.

126838406639 is a deficient number, since it is larger than the sum of its proper divisors (21963897361).

126838406639 is an equidigital number, since it uses as much as digits as its factorization.

126838406639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214507 (or 2214493 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 56.

The spelling of 126838406639 in words is "one hundred twenty-six billion, eight hundred thirty-eight million, four hundred six thousand, six hundred thirty-nine".