3721666 has 8 divisors (see below), whose sum is σ = 6011964. Its totient is φ = 1717680.

The previous prime is 3721631. The next prime is 3721673. The reversal of 3721666 is 6661273.

It can be written as a sum of positive squares in 2 ways, for example, as 3721041 + 625 = 1929^2 + 25^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71545 + ... + 71596.

Almost surely, 2^3721666 is an apocalyptic number.

3721666 is a deficient number, since it is larger than the sum of its proper divisors (2290298).

3721666 is a wasteful number, since it uses less digits than its factorization.

3721666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143156.

The product of its digits is 9072, while the sum is 31.

The square root of 3721666 is about 1929.1619942348. The cubic root of 3721666 is about 154.9693453079.

The spelling of 3721666 in words is "three million, seven hundred twenty-one thousand, six hundred sixty-six".