3945961 has 4 divisors (see below), whose sum is σ = 3960900. Its totient is φ = 3931024.

The previous prime is 3945937. The next prime is 3945973. The reversal of 3945961 is 1695493.

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 1243225 + 2702736 = 1115^2 + 1644^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945961 - 2⁹ = 3945449 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 3945961.

It is not an unprimeable number, because it can be changed into a prime (3945661) by changing a digit.

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, 7066 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (990225).

Almost surely, 2^3945961 is an apocalyptic number.

It is an amenable number.

3945961 is a deficient number, since it is larger than the sum of its proper divisors (14939).

3945961 is a wasteful number, since it uses less digits than its factorization.

3945961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14938.

The product of its digits is 29160, while the sum is 37.

The square root of 3945961 is about 1986.4443108227. Note that the first 3 decimals coincide. The cubic root of 3945961 is about 158.0220153054.

The spelling of 3945961 in words is "three million, nine hundred forty-five thousand, nine hundred sixty-one".