1944889 has 4 divisors (see below), whose sum is σ = 1949220. Its totient is φ = 1940560.

The previous prime is 1944883. The next prime is 1944911. The reversal of 1944889 is 9884491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9884491 = 1439 ⋅6869.

It can be written as a sum of positive squares in 2 ways, for example, as 1669264 + 275625 = 1292^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944889 - 2³ = 1944881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1944881) 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 in 3 ways as a sum of consecutive naturals, for example, 1402 + ... + 2419.

It is an arithmetic number, because the mean of its divisors is an integer number (487305).

2^1944889 is an apocalyptic number.

It is an amenable number.

1944889 is a deficient number, since it is larger than the sum of its proper divisors (4331).

1944889 is an equidigital number, since it uses as much as digits as its factorization.

1944889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330.

The product of its digits is 82944, while the sum is 43.

The square root of 1944889 is about 1394.5927721023. The cubic root of 1944889 is about 124.8240511188.

The spelling of 1944889 in words is "one million, nine hundred forty-four thousand, eight hundred eighty-nine".