2179989947 has 4 divisors (see below), whose sum is σ = 2294726280. Its totient is φ = 2065253616.

The previous prime is 2179989923. The next prime is 2179989949. The reversal of 2179989947 is 7499899712.

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

It is a cyclic number.

It is not a de Polignac number, because 2179989947 - 2¹² = 2179985851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2179989949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57368138 + ... + 57368175.

It is an arithmetic number, because the mean of its divisors is an integer number (573681570).

Almost surely, 2^2179989947 is an apocalyptic number.

2179989947 is a deficient number, since it is larger than the sum of its proper divisors (114736333).

2179989947 is a wasteful number, since it uses less digits than its factorization.

2179989947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114736332.

The product of its digits is 20575296, while the sum is 65.

The square root of 2179989947 is about 46690.3624637890. The cubic root of 2179989947 is about 1296.6362638359.

The spelling of 2179989947 in words is "two billion, one hundred seventy-nine million, nine hundred eighty-nine thousand, nine hundred forty-seven".