2154228188 has 24 divisors (see below), whose sum is σ = 4309519200. Its totient is φ = 923012928.

The previous prime is 2154228187. The next prime is 2154228203. The reversal of 2154228188 is 8818224512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154228187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157778 + ... + 170886.

It is an arithmetic number, because the mean of its divisors is an integer number (179563300).

Almost surely, 2^2154228188 is an apocalyptic number.

2154228188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2154228188 is an abundant number, since it is smaller than the sum of its proper divisors (2155291012).

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

2154228188 is a wasteful number, since it uses less digits than its factorization.

2154228188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18989 (or 18987 counting only the distinct ones).

The product of its digits is 81920, while the sum is 41.

The square root of 2154228188 is about 46413.6638071161. The cubic root of 2154228188 is about 1291.5083987911.

The spelling of 2154228188 in words is "two billion, one hundred fifty-four million, two hundred twenty-eight thousand, one hundred eighty-eight".