138421542 has 16 divisors (see below), whose sum is σ = 316392192. Its totient is φ = 39549000.

The previous prime is 138421511. The next prime is 138421579. The reversal of 138421542 is 245124831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1647834 + ... + 1647917.

It is an arithmetic number, because the mean of its divisors is an integer number (19774512).

Almost surely, 2^138421542 is an apocalyptic number.

138421542 is an abundant number, since it is smaller than the sum of its proper divisors (177970650).

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

138421542 is a wasteful number, since it uses less digits than its factorization.

138421542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295763.

The product of its digits is 7680, while the sum is 30.

The square root of 138421542 is about 11765.2684627254. The cubic root of 138421542 is about 517.2905694132.

The spelling of 138421542 in words is "one hundred thirty-eight million, four hundred twenty-one thousand, five hundred forty-two".