1779823 has 2 divisors, whose sum is σ = 1779824. Its totient is φ = 1779822.

The previous prime is 1779821. The next prime is 1779829. The reversal of 1779823 is 3289771.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1779823 - 2¹ = 1779821 is a prime.

It is a super-2 number, since 2×1779823² = 6335539822658, which contains 22 as substring.

Together with 1779821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1779821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889911 + 889912.

It is an arithmetic number, because the mean of its divisors is an integer number (889912).

2^1779823 is an apocalyptic number.

1779823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779823 is an equidigital number, since it uses as much as digits as its factorization.

1779823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 1779823 is about 1334.1000712091. The cubic root of 1779823 is about 121.1878102450.

It can be divided in two parts, 177 and 9823, that added together give a 4-th power (10000 = 10⁴).

The spelling of 1779823 in words is "one million, seven hundred seventy-nine thousand, eight hundred twenty-three".