2189889812 has 12 divisors (see below), whose sum is σ = 4180698816. Its totient is φ = 995404440.

The previous prime is 2189889809. The next prime is 2189889839.

2189889812 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24885068 + ... + 24885155.

It is an arithmetic number, because the mean of its divisors is an integer number (348391568).

Almost surely, 2^2189889812 is an apocalyptic number.

2189889812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2189889812 is a deficient number, since it is larger than the sum of its proper divisors (1990809004).

2189889812 is a wasteful number, since it uses less digits than its factorization.

2189889812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49770238 (or 49770236 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 56.

The square root of 2189889812 is about 46796.2585256557. The cubic root of 2189889812 is about 1298.5960804548.

The spelling of 2189889812 in words is "two billion, one hundred eighty-nine million, eight hundred eighty-nine thousand, eight hundred twelve".