3928205 has 4 divisors (see below), whose sum is σ = 4713852. Its totient is φ = 3142560.

The previous prime is 3928189. The next prime is 3928229. The reversal of 3928205 is 5028293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1297321 + 2630884 = 1139^2 + 1622^2 .

It is not a de Polignac number, because 3928205 - 2⁴ = 3928189 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 392816 + ... + 392825.

It is an arithmetic number, because the mean of its divisors is an integer number (1178463).

Almost surely, 2^3928205 is an apocalyptic number.

It is an amenable number.

3928205 is a deficient number, since it is larger than the sum of its proper divisors (785647).

3928205 is an equidigital number, since it uses as much as digits as its factorization.

3928205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785646.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 3928205 is about 1981.9699795910. The cubic root of 3928205 is about 157.7846368806.

The spelling of 3928205 in words is "three million, nine hundred twenty-eight thousand, two hundred five".