3940661 has 4 divisors (see below), whose sum is σ = 4005324. Its totient is φ = 3876000.

The previous prime is 3940637. The next prime is 3940663. The reversal of 3940661 is 1660493.

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 1705636 + 2235025 = 1306^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 3940661 - 2⁶ = 3940597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32240 + ... + 32361.

It is an arithmetic number, because the mean of its divisors is an integer number (1001331).

Almost surely, 2^3940661 is an apocalyptic number.

It is an amenable number.

3940661 is a deficient number, since it is larger than the sum of its proper divisors (64663).

3940661 is an equidigital number, since it uses as much as digits as its factorization.

3940661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64662.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 3940661 is about 1985.1098206397. The cubic root of 3940661 is about 157.9512347503.

The spelling of 3940661 in words is "three million, nine hundred forty thousand, six hundred sixty-one".