39686129 has 10 divisors (see below), whose sum is σ = 46300530. Its totient is φ = 34014624.

The previous prime is 39686113. The next prime is 39686149. The reversal of 39686129 is 92168693.

It can be written as a sum of positive squares in only one way, i.e., 38725729 + 960400 = 6223^2 + 980^2 .

It is not a de Polignac number, because 39686129 - 2⁴ = 39686113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39686129.

It is not an unprimeable number, because it can be changed into a prime (39686149) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5864 + ... + 10665.

It is an arithmetic number, because the mean of its divisors is an integer number (4630053).

Almost surely, 2^39686129 is an apocalyptic number.

It is an amenable number.

39686129 is a deficient number, since it is larger than the sum of its proper divisors (6614401).

39686129 is an frugal number, since it uses more digits than its factorization.

39686129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16557 (or 16536 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 39686129 is about 6299.6927702865. The cubic root of 39686129 is about 341.0983196165.

The spelling of 39686129 in words is "thirty-nine million, six hundred eighty-six thousand, one hundred twenty-nine".