3791221 has 8 divisors (see below), whose sum is σ = 4587840. Its totient is φ = 3058368.

The previous prime is 3791219. The next prime is 3791231. The reversal of 3791221 is 1221973.

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

It is not a de Polignac number, because 3791221 - 2¹ = 3791219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3791231) 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, 15811 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (573480).

Almost surely, 2^3791221 is an apocalyptic number.

It is an amenable number.

3791221 is a deficient number, since it is larger than the sum of its proper divisors (796619).

3791221 is a wasteful number, since it uses less digits than its factorization.

3791221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31883.

The product of its digits is 756, while the sum is 25.

The square root of 3791221 is about 1947.1058009261. The cubic root of 3791221 is about 155.9288109329.

It can be divided in two parts, 379 and 1221, that added together give a square (1600 = 40²).

The spelling of 3791221 in words is "three million, seven hundred ninety-one thousand, two hundred twenty-one".