39171221 has 8 divisors (see below), whose sum is σ = 40207200. Its totient is φ = 38147760.

The previous prime is 39171203. The next prime is 39171241. The reversal of 39171221 is 12217193.

39171221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39171221 - 2¹⁴ = 39154837 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 (39171241) 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 7 ways as a sum of consecutive naturals, for example, 3386 + ... + 9476.

It is an arithmetic number, because the mean of its divisors is an integer number (5025900).

Almost surely, 2^39171221 is an apocalyptic number.

It is an amenable number.

39171221 is a deficient number, since it is larger than the sum of its proper divisors (1035979).

39171221 is a wasteful number, since it uses less digits than its factorization.

39171221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6259.

The product of its digits is 756, while the sum is 26.

The square root of 39171221 is about 6258.6916364365. The cubic root of 39171221 is about 339.6166989568.

The spelling of 39171221 in words is "thirty-nine million, one hundred seventy-one thousand, two hundred twenty-one".