138685737 has 4 divisors (see below), whose sum is σ = 184914320. Its totient is φ = 92457156.

The previous prime is 138685727. The next prime is 138685741. The reversal of 138685737 is 737586831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 138685737 - 2¹⁶ = 138620201 is a prime.

It is a super-3 number, since 3×138685737³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138685727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23114287 + ... + 23114292.

It is an arithmetic number, because the mean of its divisors is an integer number (46228580).

Almost surely, 2^138685737 is an apocalyptic number.

It is an amenable number.

138685737 is a deficient number, since it is larger than the sum of its proper divisors (46228583).

138685737 is an equidigital number, since it uses as much as digits as its factorization.

138685737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46228582.

The product of its digits is 846720, while the sum is 48.

The square root of 138685737 is about 11776.4908610333. The cubic root of 138685737 is about 517.6194650563.

The spelling of 138685737 in words is "one hundred thirty-eight million, six hundred eighty-five thousand, seven hundred thirty-seven".