138874439 has 8 divisors (see below), whose sum is σ = 159473280. Its totient is φ = 119604600.

The previous prime is 138874433. The next prime is 138874441. The reversal of 138874439 is 934478831.

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 138874439 - 2⁴ = 138874423 is a prime.

It is a super-2 number, since 2×138874439² = 38572219615129442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138874393 and 138874402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138874433) 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, 332027 + ... + 332444.

It is an arithmetic number, because the mean of its divisors is an integer number (19934160).

Almost surely, 2^138874439 is an apocalyptic number.

138874439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138874439 is a deficient number, since it is larger than the sum of its proper divisors (20598841).

138874439 is a wasteful number, since it uses less digits than its factorization.

138874439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664501.

The product of its digits is 580608, while the sum is 47.

The square root of 138874439 is about 11784.4999469642. The cubic root of 138874439 is about 517.8541240370.

The spelling of 138874439 in words is "one hundred thirty-eight million, eight hundred seventy-four thousand, four hundred thirty-nine".