138538873 has 8 divisors (see below), whose sum is σ = 153985536. Its totient is φ = 123567600.

The previous prime is 138538853. The next prime is 138538879. The reversal of 138538873 is 378835831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138538873 - 2¹³ = 138530681 is a prime.

It is a super-2 number, since 2×138538873² = 38386038664220258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138538879) 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, 118233 + ... + 119398.

It is an arithmetic number, because the mean of its divisors is an integer number (19248192).

Almost surely, 2^138538873 is an apocalyptic number.

It is an amenable number.

138538873 is a deficient number, since it is larger than the sum of its proper divisors (15446663).

138538873 is a wasteful number, since it uses less digits than its factorization.

138538873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237695.

The product of its digits is 483840, while the sum is 46.

The square root of 138538873 is about 11770.2537355828. The cubic root of 138538873 is about 517.4366860704.

The spelling of 138538873 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred seventy-three".