3817221 has 8 divisors (see below), whose sum is σ = 5110464. Its totient is φ = 2534400.

The previous prime is 3817217. The next prime is 3817237. The reversal of 3817221 is 1227183.

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

It is not a de Polignac number, because 3817221 - 2² = 3817217 is a prime.

It is a Curzon number.

3817221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3817191 and 3817200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3817211) 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, 1705 + ... + 3246.

It is an arithmetic number, because the mean of its divisors is an integer number (638808).

Almost surely, 2^3817221 is an apocalyptic number.

It is an amenable number.

3817221 is a deficient number, since it is larger than the sum of its proper divisors (1293243).

3817221 is a wasteful number, since it uses less digits than its factorization.

3817221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211.

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

The square root of 3817221 is about 1953.7709691773. The cubic root of 3817221 is about 156.2844497907.

The spelling of 3817221 in words is "three million, eight hundred seventeen thousand, two hundred twenty-one".