2878221 has 8 divisors (see below), whose sum is σ = 3970080. Its totient is φ = 1852592.

The previous prime is 2878181. The next prime is 2878229. The reversal of 2878221 is 1228782.

It is a happy number.

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 2878221 - 2⁷ = 2878093 is a prime.

It is a super-2 number, since 2×2878221² = 16568312249682, which contains 22 as substring.

2878221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2878229) 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, 16455 + ... + 16628.

It is an arithmetic number, because the mean of its divisors is an integer number (496260).

2^2878221 is an apocalyptic number.

It is an amenable number.

2878221 is a deficient number, since it is larger than the sum of its proper divisors (1091859).

2878221 is a wasteful number, since it uses less digits than its factorization.

2878221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33115.

The product of its digits is 3584, while the sum is 30.

The square root of 2878221 is about 1696.5320509793. The cubic root of 2878221 is about 142.2464311772.

The spelling of 2878221 in words is "two million, eight hundred seventy-eight thousand, two hundred twenty-one".