138487393 has 16 divisors (see below), whose sum is σ = 158247936. Its totient is φ = 119964240.

The previous prime is 138487373. The next prime is 138487397. The reversal of 138487393 is 393784831.

It is a happy number.

It is not a de Polignac number, because 138487393 - 2¹⁷ = 138356321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138487397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76780 + ... + 78562.

It is an arithmetic number, because the mean of its divisors is an integer number (9890496).

Almost surely, 2^138487393 is an apocalyptic number.

It is an amenable number.

138487393 is a deficient number, since it is larger than the sum of its proper divisors (19760543).

138487393 is a wasteful number, since it uses less digits than its factorization.

138487393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 435456, while the sum is 46.

The square root of 138487393 is about 11768.0666636453. The cubic root of 138487393 is about 517.3725862738.

The spelling of 138487393 in words is "one hundred thirty-eight million, four hundred eighty-seven thousand, three hundred ninety-three".