1944382145 has 4 divisors (see below), whose sum is σ = 2333258580. Its totient is φ = 1555505712.

The previous prime is 1944382109. The next prime is 1944382147. The reversal of 1944382145 is 5412834491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5412834491 = 48473 ⋅111667.

It can be written as a sum of positive squares in 2 ways, for example, as 861774736 + 1082607409 = 29356^2 + 32903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944382145 - 2¹² = 1944378049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1944382147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194438210 + ... + 194438219.

It is an arithmetic number, because the mean of its divisors is an integer number (583314645).

Almost surely, 2^1944382145 is an apocalyptic number.

It is an amenable number.

1944382145 is a deficient number, since it is larger than the sum of its proper divisors (388876435).

1944382145 is an equidigital number, since it uses as much as digits as its factorization.

1944382145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388876434.

The product of its digits is 138240, while the sum is 41.

The square root of 1944382145 is about 44095.1487694508. The cubic root of 1944382145 is about 1248.1320676534.

The spelling of 1944382145 in words is "one billion, nine hundred forty-four million, three hundred eighty-two thousand, one hundred forty-five".