1779827345 has 4 divisors (see below), whose sum is σ = 2135792820. Its totient is φ = 1423861872.

The previous prime is 1779827339. The next prime is 1779827347. The reversal of 1779827345 is 5437289771.

It is a Cunningham number, because it is equal to 42188²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 640697344 + 1139130001 = 25312^2 + 33751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1779827345 - 2²⁰ = 1778778769 is a prime.

It is a super-3 number, since 3×1779827345³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1779827347) 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 3 ways as a sum of consecutive naturals, for example, 177982730 + ... + 177982739.

It is an arithmetic number, because the mean of its divisors is an integer number (533948205).

Almost surely, 2^1779827345 is an apocalyptic number.

It is an amenable number.

1779827345 is a deficient number, since it is larger than the sum of its proper divisors (355965475).

1779827345 is an equidigital number, since it uses as much as digits as its factorization.

1779827345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355965474.

The product of its digits is 2963520, while the sum is 53.

The square root of 1779827345 is about 42188.0000118517. Note that the first 4 decimals coincide. The cubic root of 1779827345 is about 1211.8790886163.

The spelling of 1779827345 in words is "one billion, seven hundred seventy-nine million, eight hundred twenty-seven thousand, three hundred forty-five".