2776221 has 32 divisors (see below), whose sum is σ = 4839680. Its totient is φ = 1539648.

The previous prime is 2776217. The next prime is 2776259. The reversal of 2776221 is 1226772.

It is not a de Polignac number, because 2776221 - 2² = 2776217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2776421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6795 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (151240).

2^2776221 is an apocalyptic number.

2776221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2776221 is a deficient number, since it is larger than the sum of its proper divisors (2063459).

2776221 is a wasteful number, since it uses less digits than its factorization.

2776221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 444 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 2776221 is about 1666.1995678790. The cubic root of 2776221 is about 140.5458452316.

The spelling of 2776221 in words is "two million, seven hundred seventy-six thousand, two hundred twenty-one".