138969385 has 8 divisors (see below), whose sum is σ = 168037056. Its totient is φ = 110326320.

The previous prime is 138969379. The next prime is 138969403. The reversal of 138969385 is 583969831.

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

It is not a de Polignac number, because 138969385 - 2²⁷ = 4751657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105429 + ... + 106738.

It is an arithmetic number, because the mean of its divisors is an integer number (21004632).

Almost surely, 2^138969385 is an apocalyptic number.

It is an amenable number.

138969385 is a deficient number, since it is larger than the sum of its proper divisors (29067671).

138969385 is a wasteful number, since it uses less digits than its factorization.

138969385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212303.

The product of its digits is 1399680, while the sum is 52.

The square root of 138969385 is about 11788.5276858478. The cubic root of 138969385 is about 517.9721130567.

The spelling of 138969385 in words is "one hundred thirty-eight million, nine hundred sixty-nine thousand, three hundred eighty-five".