138353439 has 16 divisors (see below), whose sum is σ = 210988800. Its totient is φ = 78997440.

The previous prime is 138353431. The next prime is 138353443. The reversal of 138353439 is 934353831.

It is not a de Polignac number, because 138353439 - 2³ = 138353431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138353397 and 138353406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138353431) 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, 49912 + ... + 52610.

It is an arithmetic number, because the mean of its divisors is an integer number (13186800).

Almost surely, 2^138353439 is an apocalyptic number.

138353439 is a deficient number, since it is larger than the sum of its proper divisors (72635361).

138353439 is a wasteful number, since it uses less digits than its factorization.

138353439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150.

The product of its digits is 116640, while the sum is 39.

The square root of 138353439 is about 11762.3738675490. The cubic root of 138353439 is about 517.2057203397.

The spelling of 138353439 in words is "one hundred thirty-eight million, three hundred fifty-three thousand, four hundred thirty-nine".