1928143939 has 4 divisors (see below), whose sum is σ = 1932952680. Its totient is φ = 1923335200.

The previous prime is 1928143907. The next prime is 1928143969. The reversal of 1928143939 is 9393418291.

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 1928143939 - 2⁵ = 1928143907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1928143892 and 1928143901.

It is not an unprimeable number, because it can be changed into a prime (1928143969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2403769 + ... + 2404570.

It is an arithmetic number, because the mean of its divisors is an integer number (483238170).

Almost surely, 2^1928143939 is an apocalyptic number.

1928143939 is a deficient number, since it is larger than the sum of its proper divisors (4808741).

1928143939 is an equidigital number, since it uses as much as digits as its factorization.

1928143939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4808740.

The product of its digits is 419904, while the sum is 49.

The square root of 1928143939 is about 43910.6358300583. The cubic root of 1928143939 is about 1244.6478230559.

The spelling of 1928143939 in words is "one billion, nine hundred twenty-eight million, one hundred forty-three thousand, nine hundred thirty-nine".