3991229 has 8 divisors (see below), whose sum is σ = 4389888. Its totient is φ = 3598560.

The previous prime is 3991223. The next prime is 3991237. The reversal of 3991229 is 9221993.

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 3991229 - 2¹⁶ = 3925693 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 (3991223) 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, 32 + ... + 2825.

It is an arithmetic number, because the mean of its divisors is an integer number (548736).

Almost surely, 2^3991229 is an apocalyptic number.

It is an amenable number.

3991229 is a deficient number, since it is larger than the sum of its proper divisors (398659).

3991229 is a wasteful number, since it uses less digits than its factorization.

3991229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995.

The product of its digits is 8748, while the sum is 35.

The square root of 3991229 is about 1997.8060466422. The cubic root of 3991229 is about 158.6239944996.

The spelling of 3991229 in words is "three million, nine hundred ninety-one thousand, two hundred twenty-nine".