39671221 has 8 divisors (see below), whose sum is σ = 41842080. Its totient is φ = 37508688.

The previous prime is 39671209. The next prime is 39671239. The reversal of 39671221 is 12217693.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39671221 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 (39671921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9375 + ... + 12931.

It is an arithmetic number, because the mean of its divisors is an integer number (5230260).

Almost surely, 2^39671221 is an apocalyptic number.

It is an amenable number.

39671221 is a deficient number, since it is larger than the sum of its proper divisors (2170859).

39671221 is a wasteful number, since it uses less digits than its factorization.

39671221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163.

The product of its digits is 4536, while the sum is 31.

The square root of 39671221 is about 6298.5094268406. The cubic root of 39671221 is about 341.0556033430.

It can be divided in two parts, 396 and 71221, that added together give a palindrome (71617).

The spelling of 39671221 in words is "thirty-nine million, six hundred seventy-one thousand, two hundred twenty-one".