138440038 has 16 divisors (see below), whose sum is σ = 226727424. Its totient is φ = 62874760.

The previous prime is 138440021. The next prime is 138440039. The reversal of 138440038 is 830044831.

It is a junction number, because it is equal to n+sod(n) for n = 138439991 and 138440009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138440039) 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, 38931 + ... + 42337.

It is an arithmetic number, because the mean of its divisors is an integer number (14170464).

Almost surely, 2^138440038 is an apocalyptic number.

138440038 is a deficient number, since it is larger than the sum of its proper divisors (88287386).

138440038 is a wasteful number, since it uses less digits than its factorization.

138440038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 138440038 is about 11766.0544788812. The cubic root of 138440038 is about 517.3136086504.

Adding to 138440038 its reverse (830044831), we get a palindrome (968484869).

The spelling of 138440038 in words is "one hundred thirty-eight million, four hundred forty thousand, thirty-eight".