1943889 has 4 divisors (see below), whose sum is σ = 2591856. Its totient is φ = 1295924.

The previous prime is 1943867. The next prime is 1943897. The reversal of 1943889 is 9883491.

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.

It is a cyclic number.

It is not a de Polignac number, because 1943889 - 2⁵ = 1943857 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1943889.

It is not an unprimeable number, because it can be changed into a prime (1943819) 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, 323979 + ... + 323984.

It is an arithmetic number, because the mean of its divisors is an integer number (647964).

2^1943889 is an apocalyptic number.

It is an amenable number.

1943889 is a deficient number, since it is larger than the sum of its proper divisors (647967).

1943889 is an equidigital number, since it uses as much as digits as its factorization.

1943889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647966.

The product of its digits is 62208, while the sum is 42.

The square root of 1943889 is about 1394.2341984043. The cubic root of 1943889 is about 124.8026539335.

The spelling of 1943889 in words is "one million, nine hundred forty-three thousand, eight hundred eighty-nine".