3981646 has 4 divisors (see below), whose sum is σ = 5972472. Its totient is φ = 1990822.

The previous prime is 3981643. The next prime is 3981647. The reversal of 3981646 is 6461893.

3981646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995410 + ... + 995413.

It is an arithmetic number, because the mean of its divisors is an integer number (1493118).

Almost surely, 2^3981646 is an apocalyptic number.

3981646 is a deficient number, since it is larger than the sum of its proper divisors (1990826).

3981646 is a wasteful number, since it uses less digits than its factorization.

3981646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990825.

The product of its digits is 31104, while the sum is 37.

The square root of 3981646 is about 1995.4062243062. The cubic root of 3981646 is about 158.4969399045.

The spelling of 3981646 in words is "three million, nine hundred eighty-one thousand, six hundred forty-six".