3672721 has 8 divisors (see below), whose sum is σ = 4040064. Its totient is φ = 3317520.

The previous prime is 3672689. The next prime is 3672727. The reversal of 3672721 is 1272763.

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

It is a cyclic number.

It is not a de Polignac number, because 3672721 - 2⁵ = 3672689 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

3672721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3672721.

It is not an unprimeable number, because it can be changed into a prime (3672727) 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, 2395 + ... + 3616.

It is an arithmetic number, because the mean of its divisors is an integer number (505008).

Almost surely, 2^3672721 is an apocalyptic number.

It is an amenable number.

3672721 is a deficient number, since it is larger than the sum of its proper divisors (367343).

3672721 is a wasteful number, since it uses less digits than its factorization.

3672721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6071.

The product of its digits is 3528, while the sum is 28.

The square root of 3672721 is about 1916.4344497008. The cubic root of 3672721 is about 154.2869922407.

The spelling of 3672721 in words is "three million, six hundred seventy-two thousand, seven hundred twenty-one".