1944189643 has 6 divisors (see below), whose sum is σ = 2137001972. Its totient is φ = 1767445020.

The previous prime is 1944189631. The next prime is 1944189671. The reversal of 1944189643 is 3469814491.

It is not a de Polignac number, because 1944189643 - 2¹³ = 1944181451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1944189613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8033721 + ... + 8033962.

Almost surely, 2^1944189643 is an apocalyptic number.

1944189643 is a deficient number, since it is larger than the sum of its proper divisors (192812329).

1944189643 is a wasteful number, since it uses less digits than its factorization.

1944189643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16067705 (or 16067694 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 1944189643 is about 44092.9659129435. The cubic root of 1944189643 is about 1248.0908761881.

The spelling of 1944189643 in words is "one billion, nine hundred forty-four million, one hundred eighty-nine thousand, six hundred forty-three".