1806916817 has 4 divisors (see below), whose sum is σ = 1810996080. Its totient is φ = 1802837556.

The previous prime is 1806916799. The next prime is 1806916819. The reversal of 1806916817 is 7186196081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7186196081 = 241 ⋅29818241.

It is a cyclic number.

It is not a de Polignac number, because 1806916817 - 2¹⁰ = 1806915793 is a prime.

It is a super-2 number, since 2×1806916817² = 6529896767114822978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806916819) 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, 2038967 + ... + 2039852.

It is an arithmetic number, because the mean of its divisors is an integer number (452749020).

Almost surely, 2^1806916817 is an apocalyptic number.

It is an amenable number.

1806916817 is a deficient number, since it is larger than the sum of its proper divisors (4079263).

1806916817 is an equidigital number, since it uses as much as digits as its factorization.

1806916817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079262.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1806916817 is about 42507.8441819860. The cubic root of 1806916817 is about 1217.9965363904.

The spelling of 1806916817 in words is "one billion, eight hundred six million, nine hundred sixteen thousand, eight hundred seventeen".