138549399 has 8 divisors (see below), whose sum is σ = 186143232. Its totient is φ = 91660920.

The previous prime is 138549391. The next prime is 138549403. The reversal of 138549399 is 993945831.

It is a happy number.

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

It is not a de Polignac number, because 138549399 - 2³ = 138549391 is a prime.

It is a super-2 number, since 2×138549399² = 38391871926522402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138549391) 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, 175879 + ... + 176664.

It is an arithmetic number, because the mean of its divisors is an integer number (23267904).

Almost surely, 2^138549399 is an apocalyptic number.

138549399 is a deficient number, since it is larger than the sum of its proper divisors (47593833).

138549399 is a wasteful number, since it uses less digits than its factorization.

138549399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352677.

The product of its digits is 1049760, while the sum is 51.

The square root of 138549399 is about 11770.7008712311. The cubic root of 138549399 is about 517.4497904564.

The spelling of 138549399 in words is "one hundred thirty-eight million, five hundred forty-nine thousand, three hundred ninety-nine".