138020439 has 8 divisors (see below), whose sum is σ = 185849712. Its totient is φ = 91102400.

The previous prime is 138020437. The next prime is 138020479. The reversal of 138020439 is 934020831.

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 138020439 - 2¹ = 138020437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138020431) 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, 227454 + ... + 228059.

It is an arithmetic number, because the mean of its divisors is an integer number (23231214).

Almost surely, 2^138020439 is an apocalyptic number.

138020439 is a deficient number, since it is larger than the sum of its proper divisors (47829273).

138020439 is a wasteful number, since it uses less digits than its factorization.

138020439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455617.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 138020439 is about 11748.2100338732. The cubic root of 138020439 is about 516.7904364366.

The spelling of 138020439 in words is "one hundred thirty-eight million, twenty thousand, four hundred thirty-nine".