2169799947 has 32 divisors (see below), whose sum is σ = 3889843200. Its totient is φ = 1166949504.

The previous prime is 2169799939. The next prime is 2169799963. The reversal of 2169799947 is 7499979612.

It is not a de Polignac number, because 2169799947 - 2³ = 2169799939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (2169799987) 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 31 ways as a sum of consecutive naturals, for example, 334447 + ... + 340872.

It is an arithmetic number, because the mean of its divisors is an integer number (121557600).

Almost surely, 2^2169799947 is an apocalyptic number.

2169799947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2169799947 is a deficient number, since it is larger than the sum of its proper divisors (1720043253).

2169799947 is a wasteful number, since it uses less digits than its factorization.

2169799947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675352 (or 675346 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 63.

The square root of 2169799947 is about 46581.1114830894. Note that the first 3 decimals coincide. The cubic root of 2169799947 is about 1294.6128043444.

The spelling of 2169799947 in words is "two billion, one hundred sixty-nine million, seven hundred ninety-nine thousand, nine hundred forty-seven".