2221878946 has 8 divisors (see below), whose sum is σ = 3808935360. Its totient is φ = 952233828.

The previous prime is 2221878931. The next prime is 2221878973. The reversal of 2221878946 is 6498781222.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2221878946.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79352806 + ... + 79352833.

It is an arithmetic number, because the mean of its divisors is an integer number (476116920).

Almost surely, 2^2221878946 is an apocalyptic number.

2221878946 is a deficient number, since it is larger than the sum of its proper divisors (1587056414).

2221878946 is a wasteful number, since it uses less digits than its factorization.

2221878946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158705648.

The product of its digits is 774144, while the sum is 49.

The square root of 2221878946 is about 47136.8109443140. The cubic root of 2221878946 is about 1304.8886828807. Note that the first 3 decimals are identical.

The spelling of 2221878946 in words is "two billion, two hundred twenty-one million, eight hundred seventy-eight thousand, nine hundred forty-six".