2189951228 has 12 divisors (see below), whose sum is σ = 3956041152. Its totient is φ = 1059653760.

The previous prime is 2189951221. The next prime is 2189951251. The reversal of 2189951228 is 8221599812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189951221) 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, 8830325 + ... + 8830572.

It is an arithmetic number, because the mean of its divisors is an integer number (329670096).

Almost surely, 2^2189951228 is an apocalyptic number.

It is an amenable number.

2189951228 is a deficient number, since it is larger than the sum of its proper divisors (1766089924).

2189951228 is a wasteful number, since it uses less digits than its factorization.

2189951228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17660932 (or 17660930 counting only the distinct ones).

The product of its digits is 207360, while the sum is 47.

The square root of 2189951228 is about 46796.9147273621. The cubic root of 2189951228 is about 1298.6082201571.

The spelling of 2189951228 in words is "two billion, one hundred eighty-nine million, nine hundred fifty-one thousand, two hundred twenty-eight".