3956641 has 4 divisors (see below), whose sum is σ = 4261012. Its totient is φ = 3652272.

The previous prime is 3956639. The next prime is 3956647. The reversal of 3956641 is 1466593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1466593 = 251 ⋅5843.

It can be written as a sum of positive squares in 2 ways, for example, as 2190400 + 1766241 = 1480^2 + 1329^2 .

It is not a de Polignac number, because 3956641 - 2¹ = 3956639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3956597 and 3956606.

It is not an unprimeable number, because it can be changed into a prime (3956647) 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, 152166 + ... + 152191.

It is an arithmetic number, because the mean of its divisors is an integer number (1065253).

Almost surely, 2^3956641 is an apocalyptic number.

It is an amenable number.

3956641 is a deficient number, since it is larger than the sum of its proper divisors (304371).

3956641 is a wasteful number, since it uses less digits than its factorization.

3956641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304370.

The product of its digits is 19440, while the sum is 34.

The square root of 3956641 is about 1989.1307146590. The cubic root of 3956641 is about 158.1644524969.

It can be divided in two parts, 395 and 6641, that multiplied together give a triangular number (2623195 = T₂₂₉₀).

The spelling of 3956641 in words is "three million, nine hundred fifty-six thousand, six hundred forty-one".