2138699189 has 4 divisors (see below), whose sum is σ = 2333126400. Its totient is φ = 1944271980.

The previous prime is 2138699159. The next prime is 2138699231. The reversal of 2138699189 is 9819968312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2138699189 - 2¹² = 2138695093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138699159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97213589 + ... + 97213610.

It is an arithmetic number, because the mean of its divisors is an integer number (583281600).

Almost surely, 2^2138699189 is an apocalyptic number.

It is an amenable number.

2138699189 is a deficient number, since it is larger than the sum of its proper divisors (194427211).

2138699189 is a wasteful number, since it uses less digits than its factorization.

2138699189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194427210.

The product of its digits is 1679616, while the sum is 56.

The square root of 2138699189 is about 46246.0721467240. The cubic root of 2138699189 is about 1288.3975834717.

The spelling of 2138699189 in words is "two billion, one hundred thirty-eight million, six hundred ninety-nine thousand, one hundred eighty-nine".