138238426 has 8 divisors (see below), whose sum is σ = 207410580. Its totient is φ = 69101568.

The previous prime is 138238417. The next prime is 138238427. The reversal of 138238426 is 624832831.

It can be written as a sum of positive squares in 2 ways, for example, as 135839025 + 2399401 = 11655^2 + 1549^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138238427) 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, 5850 + ... + 17626.

Almost surely, 2^138238426 is an apocalyptic number.

138238426 is a deficient number, since it is larger than the sum of its proper divisors (69172154).

138238426 is a wasteful number, since it uses less digits than its factorization.

138238426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17648.

The product of its digits is 55296, while the sum is 37.

The square root of 138238426 is about 11757.4838294594. The cubic root of 138238426 is about 517.0623631695.

The spelling of 138238426 in words is "one hundred thirty-eight million, two hundred thirty-eight thousand, four hundred twenty-six".