2189739979 has 12 divisors (see below), whose sum is σ = 2560457784. Its totient is φ = 1867186944.

The previous prime is 2189739977. The next prime is 2189740009. The reversal of 2189739979 is 9799379812.

It is not a de Polignac number, because 2189739979 - 2¹ = 2189739977 is a prime.

It is a super-2 number, since 2×2189739979² = 9589922351261840882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2189739979.

It is not an unprimeable number, because it can be changed into a prime (2189739977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106317 + ... + 125230.

It is an arithmetic number, because the mean of its divisors is an integer number (213371482).

Almost surely, 2^2189739979 is an apocalyptic number.

2189739979 is a deficient number, since it is larger than the sum of its proper divisors (370717805).

2189739979 is a wasteful number, since it uses less digits than its factorization.

2189739979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231754 (or 231747 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 64.

The square root of 2189739979 is about 46794.6575903703. The cubic root of 2189739979 is about 1298.5664629853.

The spelling of 2189739979 in words is "two billion, one hundred eighty-nine million, seven hundred thirty-nine thousand, nine hundred seventy-nine".