3718221 has 8 divisors (see below), whose sum is σ = 5339040. Its totient is φ = 2288112.

The previous prime is 3718207. The next prime is 3718229. The reversal of 3718221 is 1228173.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3718221 - 2¹¹ = 3716173 is a prime.

3718221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3718191 and 3718200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3718229) 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, 47631 + ... + 47708.

It is an arithmetic number, because the mean of its divisors is an integer number (667380).

Almost surely, 2^3718221 is an apocalyptic number.

It is an amenable number.

3718221 is a deficient number, since it is larger than the sum of its proper divisors (1620819).

3718221 is a wasteful number, since it uses less digits than its factorization.

3718221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95355.

The product of its digits is 672, while the sum is 24.

The square root of 3718221 is about 1928.2689127816. The cubic root of 3718221 is about 154.9215142015.

The spelling of 3718221 in words is "three million, seven hundred eighteen thousand, two hundred twenty-one".