2123890128 has 30 divisors (see below), whose sum is σ = 5943942914. Its totient is φ = 707963328.

The previous prime is 2123890123. The next prime is 2123890141. The reversal of 2123890128 is 8210983212.

It can be written as a sum of positive squares in only one way, i.e., 1407150144 + 716739984 = 37512^2 + 26772^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2123890092 and 2123890101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123890123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7374475 + ... + 7374762.

Almost surely, 2^2123890128 is an apocalyptic number.

It is an amenable number.

2123890128 is an abundant number, since it is smaller than the sum of its proper divisors (3820052786).

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

2123890128 is a wasteful number, since it uses less digits than its factorization.

2123890128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14749251 (or 14749242 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 2123890128 is about 46085.6824621270. The cubic root of 2123890128 is about 1285.4169294135.

The spelling of 2123890128 in words is "two billion, one hundred twenty-three million, eight hundred ninety thousand, one hundred twenty-eight".