3721656 has 16 divisors (see below), whose sum is σ = 9304200. Its totient is φ = 1240544.

The previous prime is 3721631. The next prime is 3721673. The reversal of 3721656 is 6561273.

3721656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77511 + ... + 77558.

Almost surely, 2^3721656 is an apocalyptic number.

It is an amenable number.

3721656 is an abundant number, since it is smaller than the sum of its proper divisors (5582544).

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

3721656 is a wasteful number, since it uses less digits than its factorization.

3721656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155078 (or 155074 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 3721656 is about 1929.1594024341. The cubic root of 3721656 is about 154.9692065085.

The spelling of 3721656 in words is "three million, seven hundred twenty-one thousand, six hundred fifty-six".