138127938 has 16 divisors (see below), whose sum is σ = 297506496. Its totient is φ = 42500880.

The previous prime is 138127933. The next prime is 138127943. The reversal of 138127938 is 839721831.

It is an interprime number because it is at equal distance from previous prime (138127933) and next prime (138127943).

It is a super-2 number, since 2×138127938² = 38158654512263688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138127938.

It is not an unprimeable number, because it can be changed into a prime (138127931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885358 + ... + 885513.

It is an arithmetic number, because the mean of its divisors is an integer number (18594156).

Almost surely, 2^138127938 is an apocalyptic number.

138127938 is an abundant number, since it is smaller than the sum of its proper divisors (159378558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138127938 is a wasteful number, since it uses less digits than its factorization.

138127938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770889.

The product of its digits is 72576, while the sum is 42.

The square root of 138127938 is about 11752.7842658665. The cubic root of 138127938 is about 516.9245712519.

The spelling of 138127938 in words is "one hundred thirty-eight million, one hundred twenty-seven thousand, nine hundred thirty-eight".