2221278 has 8 divisors (see below), whose sum is σ = 4442568. Its totient is φ = 740424.

The previous prime is 2221273. The next prime is 2221301. The reversal of 2221278 is 8721222.

It is a happy number.

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

2221278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221273) 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, 185101 + ... + 185112.

It is an arithmetic number, because the mean of its divisors is an integer number (555321).

2^2221278 is an apocalyptic number.

2221278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2221278 is a wasteful number, since it uses less digits than its factorization.

2221278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370218.

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

The square root of 2221278 is about 1490.3952495899. The cubic root of 2221278 is about 130.4771028955.

The spelling of 2221278 in words is "two million, two hundred twenty-one thousand, two hundred seventy-eight".