138740236 has 6 divisors (see below), whose sum is σ = 242795420. Its totient is φ = 69370116.

The previous prime is 138740233. The next prime is 138740293. The reversal of 138740236 is 632047831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138740233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17342526 + ... + 17342533.

Almost surely, 2^138740236 is an apocalyptic number.

It is an amenable number.

138740236 is a deficient number, since it is larger than the sum of its proper divisors (104055184).

138740236 is a wasteful number, since it uses less digits than its factorization.

138740236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34685063 (or 34685061 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 138740236 is about 11778.8045233801. The cubic root of 138740236 is about 517.6872587349.

The spelling of 138740236 in words is "one hundred thirty-eight million, seven hundred forty thousand, two hundred thirty-six".