138943238 has 32 divisors (see below), whose sum is σ = 254864640. Its totient is φ = 55481760.

The previous prime is 138943223. The next prime is 138943243. The reversal of 138943238 is 832349831.

It is a junction number, because it is equal to n+sod(n) for n = 138943195 and 138943204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11945 + ... + 20507.

It is an arithmetic number, because the mean of its divisors is an integer number (7964520).

Almost surely, 2^138943238 is an apocalyptic number.

138943238 is a deficient number, since it is larger than the sum of its proper divisors (115921402).

138943238 is a wasteful number, since it uses less digits than its factorization.

138943238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8652.

The product of its digits is 124416, while the sum is 41.

The square root of 138943238 is about 11787.4186317446. The cubic root of 138943238 is about 517.9396256463.

The spelling of 138943238 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, two hundred thirty-eight".