138837693 has 8 divisors (see below), whose sum is σ = 194860000. Its totient is φ = 87686928.

The previous prime is 138837689. The next prime is 138837697. The reversal of 138837693 is 396738831.

It is an interprime number because it is at equal distance from previous prime (138837689) and next prime (138837697).

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

It is not a de Polignac number, because 138837693 - 2² = 138837689 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 (138837697) 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, 1217818 + ... + 1217931.

It is an arithmetic number, because the mean of its divisors is an integer number (24357500).

Almost surely, 2^138837693 is an apocalyptic number.

It is an amenable number.

138837693 is a deficient number, since it is larger than the sum of its proper divisors (56022307).

138837693 is a wasteful number, since it uses less digits than its factorization.

138837693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435771.

The product of its digits is 653184, while the sum is 48.

The square root of 138837693 is about 11782.9407619660. The cubic root of 138837693 is about 517.8084454936.

The spelling of 138837693 in words is "one hundred thirty-eight million, eight hundred thirty-seven thousand, six hundred ninety-three".