1944304021 has 16 divisors (see below), whose sum is σ = 2163091968. Its totient is φ = 1732777200.

The previous prime is 1944304007. The next prime is 1944304027. The reversal of 1944304021 is 1204034491.

It is not a de Polignac number, because 1944304021 - 2⁹ = 1944303509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944304027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149256 + ... + 161758.

It is an arithmetic number, because the mean of its divisors is an integer number (135193248).

Almost surely, 2^1944304021 is an apocalyptic number.

1944304021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1944304021 is a deficient number, since it is larger than the sum of its proper divisors (218787947).

1944304021 is a wasteful number, since it uses less digits than its factorization.

1944304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12792.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1944304021 is about 44094.2629034663. The cubic root of 1944304021 is about 1248.1153510534.

The spelling of 1944304021 in words is "one billion, nine hundred forty-four million, three hundred four thousand, twenty-one".