1944391 has 4 divisors (see below), whose sum is σ = 1961712. Its totient is φ = 1927072.

The previous prime is 1944389. The next prime is 1944401. The reversal of 1944391 is 1934491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1944391 - 2¹ = 1944389 is a prime.

It is a Duffinian number.

1944391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944311) 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, 8491 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (490428).

2^1944391 is an apocalyptic number.

1944391 is a deficient number, since it is larger than the sum of its proper divisors (17321).

1944391 is a wasteful number, since it uses less digits than its factorization.

1944391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17320.

The product of its digits is 3888, while the sum is 31.

The square root of 1944391 is about 1394.4142139264. The cubic root of 1944391 is about 124.8133962376.

The spelling of 1944391 in words is "one million, nine hundred forty-four thousand, three hundred ninety-one".