3981445 has 8 divisors (see below), whose sum is σ = 5145336. Its totient is φ = 2940096.

The previous prime is 3981421. The next prime is 3981449. The reversal of 3981445 is 5441893.

It can be written as a sum of positive squares in 4 ways, for example, as 37249 + 3944196 = 193^2 + 1986^2 .

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 3981445 - 2¹³ = 3973253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3981445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981449) 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, 30562 + ... + 30691.

It is an arithmetic number, because the mean of its divisors is an integer number (643167).

Almost surely, 2^3981445 is an apocalyptic number.

It is an amenable number.

3981445 is a deficient number, since it is larger than the sum of its proper divisors (1163891).

3981445 is a wasteful number, since it uses less digits than its factorization.

3981445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61271.

The product of its digits is 17280, while the sum is 34.

The square root of 3981445 is about 1995.3558579862. The cubic root of 3981445 is about 158.4942727981.

The spelling of 3981445 in words is "three million, nine hundred eighty-one thousand, four hundred forty-five".