126138839 has 4 divisors (see below), whose sum is σ = 126209856. Its totient is φ = 126067824.

The previous prime is 126138829. The next prime is 126138851. The reversal of 126138839 is 938831621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126138839 - 2²⁰ = 125090263 is a prime.

It is a super-2 number, since 2×126138839² = 31822013408535842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126138796 and 126138805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126138829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32774 + ... + 36419.

It is an arithmetic number, because the mean of its divisors is an integer number (31552464).

Almost surely, 2^126138839 is an apocalyptic number.

126138839 is a deficient number, since it is larger than the sum of its proper divisors (71017).

126138839 is an equidigital number, since it uses as much as digits as its factorization.

126138839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71016.

The product of its digits is 62208, while the sum is 41.

The square root of 126138839 is about 11231.1548382168. The cubic root of 126138839 is about 501.5138638068.

The spelling of 126138839 in words is "one hundred twenty-six million, one hundred thirty-eight thousand, eight hundred thirty-nine".