1928475989 has 4 divisors (see below), whose sum is σ = 2103792000. Its totient is φ = 1753159980.

The previous prime is 1928475973. The next prime is 1928476007. The reversal of 1928475989 is 9895748291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1928475989 - 2⁴ = 1928475973 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 (1928475389) 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, 87657989 + ... + 87658010.

It is an arithmetic number, because the mean of its divisors is an integer number (525948000).

Almost surely, 2^1928475989 is an apocalyptic number.

It is an amenable number.

1928475989 is a deficient number, since it is larger than the sum of its proper divisors (175316011).

1928475989 is a wasteful number, since it uses less digits than its factorization.

1928475989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175316010.

The product of its digits is 13063680, while the sum is 62.

The square root of 1928475989 is about 43914.4166419184. The cubic root of 1928475989 is about 1244.7192668210.

The spelling of 1928475989 in words is "one billion, nine hundred twenty-eight million, four hundred seventy-five thousand, nine hundred eighty-nine".