138963909 has 8 divisors (see below), whose sum is σ = 211754560. Its totient is φ = 79407936.

The previous prime is 138963901. The next prime is 138963919. The reversal of 138963909 is 909369831.

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 138963909 - 2³ = 138963901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138963901) 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, 3308644 + ... + 3308685.

It is an arithmetic number, because the mean of its divisors is an integer number (26469320).

Almost surely, 2^138963909 is an apocalyptic number.

It is an amenable number.

138963909 is a deficient number, since it is larger than the sum of its proper divisors (72790651).

138963909 is an equidigital number, since it uses as much as digits as its factorization.

138963909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6617339.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 138963909 is about 11788.2954238516. The cubic root of 138963909 is about 517.9653095138.

The spelling of 138963909 in words is "one hundred thirty-eight million, nine hundred sixty-three thousand, nine hundred nine".