138937542 has 16 divisors (see below), whose sum is σ = 281682480. Its totient is φ = 45677952.

The previous prime is 138937529. The next prime is 138937543. The reversal of 138937542 is 245739831.

It is a junction number, because it is equal to n+sod(n) for n = 138937494 and 138937503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138937543) 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, 158167 + ... + 159042.

It is an arithmetic number, because the mean of its divisors is an integer number (17605155).

Almost surely, 2^138937542 is an apocalyptic number.

138937542 is an abundant number, since it is smaller than the sum of its proper divisors (142744938).

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

138937542 is a wasteful number, since it uses less digits than its factorization.

138937542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317287.

The product of its digits is 181440, while the sum is 42.

The square root of 138937542 is about 11787.1770157235. The cubic root of 138937542 is about 517.9325478774.

The spelling of 138937542 in words is "one hundred thirty-eight million, nine hundred thirty-seven thousand, five hundred forty-two".