138436126 has 16 divisors (see below), whose sum is σ = 217130400. Its totient is φ = 66196944.

The previous prime is 138436121. The next prime is 138436127. The reversal of 138436126 is 621634831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138436091 and 138436100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138436121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21490 + ... + 27178.

It is an arithmetic number, because the mean of its divisors is an integer number (13570650).

Almost surely, 2^138436126 is an apocalyptic number.

138436126 is a deficient number, since it is larger than the sum of its proper divisors (78694274).

138436126 is an frugal number, since it uses more digits than its factorization.

138436126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760 (or 5714 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 138436126 is about 11765.8882367631. Note that the first 3 decimals coincide. The cubic root of 138436126 is about 517.3087359033.

The spelling of 138436126 in words is "one hundred thirty-eight million, four hundred thirty-six thousand, one hundred twenty-six".