3777221 has 16 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 2986368.

The previous prime is 3777217. The next prime is 3777223. The reversal of 3777221 is 1227773.

3777221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3777221 - 2² = 3777217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3777223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4265 + ... + 5073.

It is an arithmetic number, because the mean of its divisors is an integer number (291600).

Almost surely, 2^3777221 is an apocalyptic number.

It is an amenable number.

3777221 is a deficient number, since it is larger than the sum of its proper divisors (888379).

3777221 is a wasteful number, since it uses less digits than its factorization.

3777221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868.

The product of its digits is 4116, while the sum is 29.

The square root of 3777221 is about 1943.5073964356. The cubic root of 3777221 is about 155.7366392492.

The spelling of 3777221 in words is "three million, seven hundred seventy-seven thousand, two hundred twenty-one".