3778221 has 8 divisors (see below), whose sum is σ = 5046624. Its totient is φ = 2514320.

The previous prime is 3778217. The next prime is 3778237. The reversal of 3778221 is 1228773.

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

It is a cyclic number.

It is not a de Polignac number, because 3778221 - 2² = 3778217 is a prime.

It is an Ulam number.

3778221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3778241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2590 + ... + 3776.

It is an arithmetic number, because the mean of its divisors is an integer number (630828).

Almost surely, 2^3778221 is an apocalyptic number.

It is an amenable number.

3778221 is a deficient number, since it is larger than the sum of its proper divisors (1268403).

3778221 is a wasteful number, since it uses less digits than its factorization.

3778221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251.

The product of its digits is 4704, while the sum is 30.

The square root of 3778221 is about 1943.7646462471. The cubic root of 3778221 is about 155.7503815303.

The spelling of 3778221 in words is "three million, seven hundred seventy-eight thousand, two hundred twenty-one".