3981205 has 8 divisors (see below), whose sum is σ = 4838400. Its totient is φ = 3144336.

The previous prime is 3981193. The next prime is 3981209. The reversal of 3981205 is 5021893.

3981205 is nontrivially palindromic in base 12.

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 3981205 - 2⁹ = 3980693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981209) 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, 4645 + ... + 5434.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^3981205 is an apocalyptic number.

It is an amenable number.

3981205 is a deficient number, since it is larger than the sum of its proper divisors (857195).

3981205 is a wasteful number, since it uses less digits than its factorization.

3981205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10163.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3981205 is about 1995.2957174314. The cubic root of 3981205 is about 158.4910880758.

It can be divided in two parts, 3981 and 205, that added together give a triangular number (4186 = T₉₁).

The spelling of 3981205 in words is "three million, nine hundred eighty-one thousand, two hundred five".