1912389 has 4 divisors (see below), whose sum is σ = 2549856. Its totient is φ = 1274924.

The previous prime is 1912387. The next prime is 1912423. The reversal of 1912389 is 9832191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9832191 = 3 ⋅3277397.

It is a cyclic number.

It is not a de Polignac number, because 1912389 - 2¹ = 1912387 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912387) 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, 318729 + ... + 318734.

It is an arithmetic number, because the mean of its divisors is an integer number (637464).

2^1912389 is an apocalyptic number.

It is an amenable number.

1912389 is a deficient number, since it is larger than the sum of its proper divisors (637467).

1912389 is an equidigital number, since it uses as much as digits as its factorization.

1912389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637466.

The product of its digits is 3888, while the sum is 33.

The square root of 1912389 is about 1382.8915358769. The cubic root of 1912389 is about 124.1248525680.

The spelling of 1912389 in words is "one million, nine hundred twelve thousand, three hundred eighty-nine".