2117738447 has 8 divisors (see below), whose sum is σ = 2311715280. Its totient is φ = 1924004160.

The previous prime is 2117738431. The next prime is 2117738473. The reversal of 2117738447 is 7448377112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2117738447 - 2⁴ = 2117738431 is a prime.

It is a super-2 number, since 2×2117738447² = 8969632259803943618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2117738398 and 2117738407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117738417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42128 + ... + 77525.

It is an arithmetic number, because the mean of its divisors is an integer number (288964410).

Almost surely, 2^2117738447 is an apocalyptic number.

2117738447 is a deficient number, since it is larger than the sum of its proper divisors (193976833).

2117738447 is a wasteful number, since it uses less digits than its factorization.

2117738447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121273.

The product of its digits is 263424, while the sum is 44.

The square root of 2117738447 is about 46018.8922834959. The cubic root of 2117738447 is about 1284.1746928894.

The spelling of 2117738447 in words is "two billion, one hundred seventeen million, seven hundred thirty-eight thousand, four hundred forty-seven".