39791221 has 8 divisors (see below), whose sum is σ = 40255488. Its totient is φ = 39330000.

The previous prime is 39791209. The next prime is 39791231. The reversal of 39791221 is 12219793.

It is a happy number.

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 39791221 - 2⁵ = 39791189 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 (39791231) 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, 33996 + ... + 35146.

It is an arithmetic number, because the mean of its divisors is an integer number (5031936).

Almost surely, 2^39791221 is an apocalyptic number.

It is an amenable number.

39791221 is a deficient number, since it is larger than the sum of its proper divisors (464267).

39791221 is a wasteful number, since it uses less digits than its factorization.

39791221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523.

The product of its digits is 6804, while the sum is 34.

The square root of 39791221 is about 6308.0282973367. The cubic root of 39791221 is about 341.3991393264.

The spelling of 39791221 in words is "thirty-nine million, seven hundred ninety-one thousand, two hundred twenty-one".