3921606 has 24 divisors (see below), whose sum is σ = 9150960. Its totient is φ = 1206576.

The previous prime is 3921601. The next prime is 3921637. The reversal of 3921606 is 6061293.

It is a happy number.

3921606 is a `hidden beast` number, since 39 + 21 + 606 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 3921606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8146 + ... + 8613.

It is an arithmetic number, because the mean of its divisors is an integer number (381290).

Almost surely, 2^3921606 is an apocalyptic number.

3921606 is an abundant number, since it is smaller than the sum of its proper divisors (5229354).

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

3921606 is a wasteful number, since it uses less digits than its factorization.

3921606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16780 (or 16777 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 3921606 is about 1980.3045220370. The cubic root of 3921606 is about 157.6962331090.

Adding to 3921606 its reverse (6061293), we get a palindrome (9982899).

The spelling of 3921606 in words is "three million, nine hundred twenty-one thousand, six hundred six".