4778221 has 8 divisors (see below), whose sum is σ = 5487104. Its totient is φ = 4075920.

The previous prime is 4778197. The next prime is 4778231. The reversal of 4778221 is 1228774.

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 4778221 - 2¹¹ = 4776173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4778231) 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, 31 + ... + 3091.

It is an arithmetic number, because the mean of its divisors is an integer number (685888).

Almost surely, 2^4778221 is an apocalyptic number.

It is an amenable number.

4778221 is a deficient number, since it is larger than the sum of its proper divisors (708883).

4778221 is a wasteful number, since it uses less digits than its factorization.

4778221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291.

The product of its digits is 6272, while the sum is 31.

The square root of 4778221 is about 2185.9142252156. The cubic root of 4778221 is about 168.4310195565.

The spelling of 4778221 in words is "four million, seven hundred seventy-eight thousand, two hundred twenty-one".