1801823 has 2 divisors, whose sum is σ = 1801824. Its totient is φ = 1801822.

The previous prime is 1801819. The next prime is 1801853. The reversal of 1801823 is 3281081.

It is a weak prime.

It is an emirp because it is prime and its reverse (3281081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1801823 - 2² = 1801819 is a prime.

It is a super-2 number, since 2×1801823² = 6493132246658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900911 + 900912.

It is an arithmetic number, because the mean of its divisors is an integer number (900912).

2^1801823 is an apocalyptic number.

1801823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801823 is an equidigital number, since it uses as much as digits as its factorization.

1801823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1801823 is about 1342.3200065558. The cubic root of 1801823 is about 121.6850921825.

It can be divided in two parts, 18018 and 23, that multiplied together give a palindrome (414414).

The spelling of 1801823 in words is "one million, eight hundred one thousand, eight hundred twenty-three".