3527221 has 4 divisors (see below), whose sum is σ = 3531232. Its totient is φ = 3523212.

The previous prime is 3527219. The next prime is 3527233. The reversal of 3527221 is 1227253.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3527221 - 2¹ = 3527219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3527192 and 3527201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3527261) 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, 51 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (882808).

Almost surely, 2^3527221 is an apocalyptic number.

It is an amenable number.

3527221 is a deficient number, since it is larger than the sum of its proper divisors (4011).

3527221 is a wasteful number, since it uses less digits than its factorization.

3527221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010.

The product of its digits is 840, while the sum is 22.

The square root of 3527221 is about 1878.0897209665. The cubic root of 3527221 is about 152.2220467751. Note that the first 3 decimals are identical.

Subtracting from 3527221 its reverse (1227253), we obtain a cube (2299968 = 132³).

The spelling of 3527221 in words is "three million, five hundred twenty-seven thousand, two hundred twenty-one".