3683721 has 8 divisors (see below), whose sum is σ = 4921504. Its totient is φ = 2450880.

The previous prime is 3683717. The next prime is 3683723. The reversal of 3683721 is 1273863.

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

It is not a de Polignac number, because 3683721 - 2² = 3683717 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3683723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1185 + ... + 2961.

It is an arithmetic number, because the mean of its divisors is an integer number (615188).

Almost surely, 2^3683721 is an apocalyptic number.

It is an amenable number.

3683721 is a deficient number, since it is larger than the sum of its proper divisors (1237783).

3683721 is a wasteful number, since it uses less digits than its factorization.

3683721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471.

The product of its digits is 6048, while the sum is 30.

The square root of 3683721 is about 1919.3022169528. The cubic root of 3683721 is about 154.4408713736.

The spelling of 3683721 in words is "three million, six hundred eighty-three thousand, seven hundred twenty-one".