3945666 has 32 divisors (see below), whose sum is σ = 8460288. Its totient is φ = 1222400.

The previous prime is 3945661. The next prime is 3945671. The reversal of 3945666 is 6665493.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3945661) and next prime (3945671).

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10111 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (264384).

Almost surely, 2^3945666 is an apocalyptic number.

3945666 is an abundant number, since it is smaller than the sum of its proper divisors (4514622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3945666 is a wasteful number, since it uses less digits than its factorization.

3945666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506.

The product of its digits is 116640, while the sum is 39.

The square root of 3945666 is about 1986.3700561577. The cubic root of 3945666 is about 158.0180772993.

The spelling of 3945666 in words is "three million, nine hundred forty-five thousand, six hundred sixty-six".