39404 has 6 divisors (see below), whose sum is σ = 68964. Its totient is φ = 19700.

The previous prime is 39397. The next prime is 39409. The reversal of 39404 is 40493.

39404 is nontrivially palindromic in base 11.

It is not an unprimeable number, because it can be changed into a prime (39409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4922 + ... + 4929.

It is an arithmetic number, because the mean of its divisors is an integer number (11494).

2³⁹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

39404 is a deficient number, since it is larger than the sum of its proper divisors (29560).

39404 is a wasteful number, since it uses less digits than its factorization.

39404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9855 (or 9853 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 39404 is about 198.5044080115. The cubic root of 39404 is about 34.0288106432.

Adding to 39404 its reverse (40493), we get a palindrome (79897).

Subtracting 39404 from its reverse (40493), we obtain a square (1089 = 33²).

The spelling of 39404 in words is "thirty-nine thousand, four hundred four".