2117819 has 4 divisors (see below), whose sum is σ = 2310360. Its totient is φ = 1925280.

The previous prime is 2117813. The next prime is 2117821. The reversal of 2117819 is 9187112.

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-2117819 is a prime.

It is a super-2 number, since 2×2117819² = 8970314633522, 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 = 2117791 and 2117800.

It is not an unprimeable number, because it can be changed into a prime (2117813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96254 + ... + 96275.

It is an arithmetic number, because the mean of its divisors is an integer number (577590).

2^2117819 is an apocalyptic number.

2117819 is a deficient number, since it is larger than the sum of its proper divisors (192541).

2117819 is a wasteful number, since it uses less digits than its factorization.

2117819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192540.

The product of its digits is 1008, while the sum is 29.

The square root of 2117819 is about 1455.2728266549. The cubic root of 2117819 is about 128.4190974852.

The spelling of 2117819 in words is "two million, one hundred seventeen thousand, eight hundred nineteen".