39391 has 4 divisors (see below), whose sum is σ = 42984. Its totient is φ = 35800.

The previous prime is 39383. The next prime is 39397. The reversal of 39391 is 19393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39391 - 2³ = 39383 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (10746).

2³⁹³⁹¹ is an apocalyptic number.

39391 is a deficient number, since it is larger than the sum of its proper divisors (3593).

39391 is a wasteful number, since it uses less digits than its factorization.

39391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592.

The product of its digits is 729, while the sum is 25.

The square root of 39391 is about 198.4716604455. The cubic root of 39391 is about 34.0250680181.

It can be divided in two parts, 393 and 91, that added together give a palindrome (484).

The spelling of 39391 in words is "thirty-nine thousand, three hundred ninety-one".