3572821 has 4 divisors (see below), whose sum is σ = 4083232. Its totient is φ = 3062412.

The previous prime is 3572819. The next prime is 3572857. The reversal of 3572821 is 1282753.

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 not a de Polignac number, because 3572821 - 2¹ = 3572819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3572821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3572321) 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, 255195 + ... + 255208.

It is an arithmetic number, because the mean of its divisors is an integer number (1020808).

Almost surely, 2^3572821 is an apocalyptic number.

It is an amenable number.

3572821 is a deficient number, since it is larger than the sum of its proper divisors (510411).

3572821 is an equidigital number, since it uses as much as digits as its factorization.

3572821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510410.

The product of its digits is 3360, while the sum is 28.

The square root of 3572821 is about 1890.1907311168. The cubic root of 3572821 is about 152.8752168672.

The spelling of 3572821 in words is "three million, five hundred seventy-two thousand, eight hundred twenty-one".