2188105956 has 36 divisors (see below), whose sum is σ = 5540426892. Its totient is φ = 728131584.

The previous prime is 2188105879. The next prime is 2188105979. The reversal of 2188105956 is 6595018812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1542132900 + 645973056 = 39270^2 + 25416^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29901 + ... + 72596.

It is an arithmetic number, because the mean of its divisors is an integer number (153900747).

Almost surely, 2^2188105956 is an apocalyptic number.

It is an amenable number.

2188105956 is an abundant number, since it is smaller than the sum of its proper divisors (3352320936).

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

2188105956 is a wasteful number, since it uses less digits than its factorization.

2188105956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103100 (or 103095 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The square root of 2188105956 is about 46777.1948282494. The cubic root of 2188105956 is about 1298.2433781284.

The spelling of 2188105956 in words is "two billion, one hundred eighty-eight million, one hundred five thousand, nine hundred fifty-six".