2164819399 has 4 divisors (see below), whose sum is σ = 2185051464. Its totient is φ = 2144587336.

The previous prime is 2164819381. The next prime is 2164819441. The reversal of 2164819399 is 9939184612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2164819399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164819339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10115872 + ... + 10116085.

It is an arithmetic number, because the mean of its divisors is an integer number (546262866).

Almost surely, 2^2164819399 is an apocalyptic number.

2164819399 is a deficient number, since it is larger than the sum of its proper divisors (20232065).

2164819399 is a wasteful number, since it uses less digits than its factorization.

2164819399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20232064.

The product of its digits is 839808, while the sum is 52.

The square root of 2164819399 is about 46527.6197435459. The cubic root of 2164819399 is about 1293.6214962131.

The spelling of 2164819399 in words is "two billion, one hundred sixty-four million, eight hundred nineteen thousand, three hundred ninety-nine".