1938009 has 4 divisors (see below), whose sum is σ = 2584016. Its totient is φ = 1292004.

The previous prime is 1938007. The next prime is 1938011. The reversal of 1938009 is 9008391.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (1938007) and next prime (1938011).

It is not a de Polignac number, because 1938009 - 2¹ = 1938007 is a prime.

It is a D-number.

It is a Duffinian number.

1938009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1938007) 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, 322999 + ... + 323004.

It is an arithmetic number, because the mean of its divisors is an integer number (646004).

2^1938009 is an apocalyptic number.

It is an amenable number.

1938009 is a deficient number, since it is larger than the sum of its proper divisors (646007).

1938009 is an equidigital number, since it uses as much as digits as its factorization.

1938009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646006.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1938009 is about 1392.1239168982. The cubic root of 1938009 is about 124.6766898185.

The spelling of 1938009 in words is "one million, nine hundred thirty-eight thousand, nine".