3928209 has 8 divisors (see below), whose sum is σ = 5292000. Its totient is φ = 2591616.

The previous prime is 3928189. The next prime is 3928229. The reversal of 3928209 is 9028293.

It is an interprime number because it is at equal distance from previous prime (3928189) and next prime (3928229).

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

It is not a de Polignac number, because 3928209 - 2¹² = 3924113 is a prime.

3928209 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3928209.

It is not an unprimeable number, because it can be changed into a prime (3928229) 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, 6459 + ... + 7040.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^3928209 is an apocalyptic number.

It is an amenable number.

3928209 is a deficient number, since it is larger than the sum of its proper divisors (1363791).

3928209 is a wasteful number, since it uses less digits than its factorization.

3928209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13599.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3928209 is about 1981.9709886878. The cubic root of 3928209 is about 157.7846904368.

The spelling of 3928209 in words is "three million, nine hundred twenty-eight thousand, two hundred nine".