3927221 has 12 divisors (see below), whose sum is σ = 4243968. Its totient is φ = 3632832.

The previous prime is 3927199. The next prime is 3927251. The reversal of 3927221 is 1227293.

It is a de Polignac number, because none of the positive numbers 2^k-3927221 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3927251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30860 + ... + 30986.

It is an arithmetic number, because the mean of its divisors is an integer number (353664).

Almost surely, 2^3927221 is an apocalyptic number.

It is an amenable number.

3927221 is a deficient number, since it is larger than the sum of its proper divisors (316747).

3927221 is a wasteful number, since it uses less digits than its factorization.

3927221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 251 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 3927221 is about 1981.7217261765. The cubic root of 3927221 is about 157.7714609688.

It can be divided in two parts, 39272 and 21, that added together give a palindrome (39293).

The spelling of 3927221 in words is "three million, nine hundred twenty-seven thousand, two hundred twenty-one".