1944991 has 2 divisors, whose sum is σ = 1944992. Its totient is φ = 1944990.

The previous prime is 1944983. The next prime is 1944997. The reversal of 1944991 is 1994491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1944991 - 2³ = 1944983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1944991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1944997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972495 + 972496.

It is an arithmetic number, because the mean of its divisors is an integer number (972496).

2^1944991 is an apocalyptic number.

1944991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944991 is an equidigital number, since it uses as much as digits as its factorization.

1944991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 1944991 is about 1394.6293414381. The cubic root of 1944991 is about 124.8262332194.

The spelling of 1944991 in words is "one million, nine hundred forty-four thousand, nine hundred ninety-one".