1912321 has 4 divisors (see below), whose sum is σ = 1919700. Its totient is φ = 1904944.

The previous prime is 1912307. The next prime is 1912357. The reversal of 1912321 is 1232191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232191 = 97 ⋅12703.

It can be written as a sum of positive squares in 2 ways, for example, as 193600 + 1718721 = 440^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912321 - 2⁷ = 1912193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1912301) 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, 3286 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (479925).

2^1912321 is an apocalyptic number.

It is an amenable number.

1912321 is a deficient number, since it is larger than the sum of its proper divisors (7379).

1912321 is an equidigital number, since it uses as much as digits as its factorization.

1912321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378.

The product of its digits is 108, while the sum is 19.

The square root of 1912321 is about 1382.8669494930. The cubic root of 1912321 is about 124.1233813558.

The spelling of 1912321 in words is "one million, nine hundred twelve thousand, three hundred twenty-one".