39684157 has 4 divisors (see below), whose sum is σ = 39710176. Its totient is φ = 39658140.

The previous prime is 39684133. The next prime is 39684173. The reversal of 39684157 is 75148693.

39684157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75148693 = 3461 ⋅21713.

It is a cyclic number.

It is not a de Polignac number, because 39684157 - 2²³ = 31295549 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 (39684107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10569 + ... + 13822.

It is an arithmetic number, because the mean of its divisors is an integer number (9927544).

It is a Poulet number, since it divides 2^39684156-1.

Almost surely, 2^39684157 is an apocalyptic number.

It is an amenable number.

39684157 is a deficient number, since it is larger than the sum of its proper divisors (26019).

39684157 is a wasteful number, since it uses less digits than its factorization.

39684157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26018.

The product of its digits is 181440, while the sum is 43.

The square root of 39684157 is about 6299.5362527729. The cubic root of 39684157 is about 341.0926698085.

The spelling of 39684157 in words is "thirty-nine million, six hundred eighty-four thousand, one hundred fifty-seven".