1028039993 has 8 divisors (see below), whose sum is σ = 1092979008. Its totient is φ = 964787824.

The previous prime is 1028039983. The next prime is 1028040029. The reversal of 1028039993 is 3999308201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028039993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028039933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420455 + ... + 422892.

It is an arithmetic number, because the mean of its divisors is an integer number (136622376).

Almost surely, 2^1028039993 is an apocalyptic number.

It is an amenable number.

1028039993 is a deficient number, since it is larger than the sum of its proper divisors (64939015).

1028039993 is an equidigital number, since it uses as much as digits as its factorization.

1028039993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843423.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 1028039993 is about 32063.0627513967. The cubic root of 1028039993 is about 1009.2606401482.

The spelling of 1028039993 in words is "one billion, twenty-eight million, thirty-nine thousand, nine hundred ninety-three".