3956661 has 8 divisors (see below), whose sum is σ = 5861760. Its totient is φ = 2637756.

The previous prime is 3956651. The next prime is 3956663. The reversal of 3956661 is 1666593.

It is not a de Polignac number, because 3956661 - 2¹⁵ = 3923893 is a prime.

3956661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3956663) 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, 73245 + ... + 73298.

It is an arithmetic number, because the mean of its divisors is an integer number (732720).

Almost surely, 2^3956661 is an apocalyptic number.

It is an amenable number.

3956661 is a deficient number, since it is larger than the sum of its proper divisors (1905099).

3956661 is a wasteful number, since it uses less digits than its factorization.

3956661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146552 (or 146546 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 3956661 is about 1989.1357419744. The cubic root of 3956661 is about 158.1647189927.

It can be divided in two parts, 395 and 6661, that added together give a square (7056 = 84²).

The spelling of 3956661 in words is "three million, nine hundred fifty-six thousand, six hundred sixty-one".