1921823 has 2 divisors, whose sum is σ = 1921824. Its totient is φ = 1921822.

The previous prime is 1921819. The next prime is 1921841. The reversal of 1921823 is 3281291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921823 - 2² = 1921819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921792 and 1921801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960911 + 960912.

It is an arithmetic number, because the mean of its divisors is an integer number (960912).

2^1921823 is an apocalyptic number.

1921823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921823 is an equidigital number, since it uses as much as digits as its factorization.

1921823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 1921823 is about 1386.2983084459. The cubic root of 1921823 is about 124.3286244953.

It can be divided in two parts, 1921 and 823, that added together give a cube (2744 = 14³).

The spelling of 1921823 in words is "one million, nine hundred twenty-one thousand, eight hundred twenty-three".