3625721 has 8 divisors (see below), whose sum is σ = 4040064. Its totient is φ = 3225520.

The previous prime is 3625711. The next prime is 3625733. The reversal of 3625721 is 1275263.

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 3625721 - 2¹⁰ = 3624697 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 (3625711) 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, 2990 + ... + 4023.

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

Almost surely, 2^3625721 is an apocalyptic number.

It is an amenable number.

3625721 is a deficient number, since it is larger than the sum of its proper divisors (414343).

3625721 is a wasteful number, since it uses less digits than its factorization.

3625721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071.

The product of its digits is 2520, while the sum is 26.

The square root of 3625721 is about 1904.1326109281. The cubic root of 3625721 is about 153.6260251628.

The spelling of 3625721 in words is "three million, six hundred twenty-five thousand, seven hundred twenty-one".