2189905389 has 20 divisors (see below), whose sum is σ = 3738675424. Its totient is φ = 1251374184.

The previous prime is 2189905369. The next prime is 2189905457. The reversal of 2189905389 is 9835099812.

2189905389 is a `hidden beast` number, since 2 + 18 + 9 + 90 + 538 + 9 = 666.

2189905389 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2189905389 - 2⁹ = 2189904877 is a prime.

It is a super-2 number, since 2×2189905389² = 9591371225542482642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189905339) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1930567 + ... + 1931700.

Almost surely, 2^2189905389 is an apocalyptic number.

It is an amenable number.

2189905389 is a deficient number, since it is larger than the sum of its proper divisors (1548770035).

2189905389 is an equidigital number, since it uses as much as digits as its factorization.

2189905389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862286 (or 3862277 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The square root of 2189905389 is about 46796.4249596056. The cubic root of 2189905389 is about 1298.5991594808.

The spelling of 2189905389 in words is "two billion, one hundred eighty-nine million, nine hundred five thousand, three hundred eighty-nine".