2721228 has 12 divisors (see below), whose sum is σ = 6349560. Its totient is φ = 907072.

The previous prime is 2721227. The next prime is 2721247. The reversal of 2721228 is 8221272.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2721198 and 2721207.

It is not an unprimeable number, because it can be changed into a prime (2721223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113373 + ... + 113396.

It is an arithmetic number, because the mean of its divisors is an integer number (529130).

2^2721228 is an apocalyptic number.

It is an amenable number.

2721228 is an abundant number, since it is smaller than the sum of its proper divisors (3628332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2721228 is a wasteful number, since it uses less digits than its factorization.

2721228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226776 (or 226774 counting only the distinct ones).

The product of its digits is 896, while the sum is 24.

The square root of 2721228 is about 1649.6145004212. The cubic root of 2721228 is about 139.6116448005.

The spelling of 2721228 in words is "two million, seven hundred twenty-one thousand, two hundred twenty-eight".