39421 has 4 divisors (see below), whose sum is σ = 40000. Its totient is φ = 38844.

The previous prime is 39419. The next prime is 39439. The reversal of 39421 is 12493.

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.

It is a cyclic number.

It is not a de Polignac number, because 39421 - 2¹ = 39419 is a prime.

It is a d-powerful number, because it can be written as 3³ + 9⁴ + 4³ + 2¹⁵ + 1 .

It is a Duffinian number.

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 (39451) 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, 171 + ... + 328.

It is an arithmetic number, because the mean of its divisors is an integer number (10000).

2³⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

39421 is a deficient number, since it is larger than the sum of its proper divisors (579).

39421 is an equidigital number, since it uses as much as digits as its factorization.

39421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578.

The product of its digits is 216, while the sum is 19.

The square root of 39421 is about 198.5472236018. The cubic root of 39421 is about 34.0337036034.

The spelling of 39421 in words is "thirty-nine thousand, four hundred twenty-one".