3538721 has 4 divisors (see below), whose sum is σ = 3549744. Its totient is φ = 3527700.

The previous prime is 3538699. The next prime is 3538747. The reversal of 3538721 is 1278353.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3538721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3538781) 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, 5015 + ... + 5676.

It is an arithmetic number, because the mean of its divisors is an integer number (887436).

Almost surely, 2^3538721 is an apocalyptic number.

It is an amenable number.

3538721 is a deficient number, since it is larger than the sum of its proper divisors (11023).

3538721 is a wasteful number, since it uses less digits than its factorization.

3538721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11022.

The product of its digits is 5040, while the sum is 29.

The square root of 3538721 is about 1881.1488511014. The cubic root of 3538721 is about 152.3873000533.

The spelling of 3538721 in words is "three million, five hundred thirty-eight thousand, seven hundred twenty-one".