39381 has 4 divisors (see below), whose sum is σ = 52512. Its totient is φ = 26252.

The previous prime is 39373. The next prime is 39383. The reversal of 39381 is 18393.

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: 18393 = 3 ⋅6131.

It is a cyclic number.

It is not a de Polignac number, because 39381 - 2³ = 39373 is a prime.

It is a super-2 number, since 2×39381² = 3101726322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39383) 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, 6561 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (13128).

2³⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

39381 is a deficient number, since it is larger than the sum of its proper divisors (13131).

39381 is a wasteful number, since it uses less digits than its factorization.

39381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13130.

The product of its digits is 648, while the sum is 24.

The square root of 39381 is about 198.4464663329. The cubic root of 39381 is about 34.0221885154.

It can be divided in two parts, 393 and 81, that added together give a palindrome (474).

The spelling of 39381 in words is "thirty-nine thousand, three hundred eighty-one".