3652721 has 4 divisors (see below), whose sum is σ = 3737712. Its totient is φ = 3567732.

The previous prime is 3652703. The next prime is 3652757. The reversal of 3652721 is 1272563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1272563 = 19 ⋅66977.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3652721 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3652771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42431 + ... + 42516.

It is an arithmetic number, because the mean of its divisors is an integer number (934428).

Almost surely, 2^3652721 is an apocalyptic number.

It is an amenable number.

3652721 is a deficient number, since it is larger than the sum of its proper divisors (84991).

3652721 is an equidigital number, since it uses as much as digits as its factorization.

3652721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84990.

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

The square root of 3652721 is about 1911.2093030330. The cubic root of 3652721 is about 154.0064229626.

The spelling of 3652721 in words is "three million, six hundred fifty-two thousand, seven hundred twenty-one".