2221678 has 4 divisors (see below), whose sum is σ = 3332520. Its totient is φ = 1110838.

The previous prime is 2221673. The next prime is 2221699. The reversal of 2221678 is 8761222.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555418 + ... + 555421.

It is an arithmetic number, because the mean of its divisors is an integer number (833130).

2^2221678 is an apocalyptic number.

2221678 is a deficient number, since it is larger than the sum of its proper divisors (1110842).

2221678 is a wasteful number, since it uses less digits than its factorization.

2221678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110841.

The product of its digits is 2688, while the sum is 28.

The square root of 2221678 is about 1490.5294361401. The cubic root of 2221678 is about 130.4849343794.

The spelling of 2221678 in words is "two million, two hundred twenty-one thousand, six hundred seventy-eight".