798921993 has 4 divisors (see below), whose sum is σ = 1065229328. Its totient is φ = 532614660.

The previous prime is 798921979. The next prime is 798922031. The reversal of 798921993 is 399129897.

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, and also an emirpimes, since its reverse is a distinct semiprime: 399129897 = 3 ⋅133043299.

It is not a de Polignac number, because 798921993 - 2⁵ = 798921961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (798921913) 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, 133153663 + ... + 133153668.

It is an arithmetic number, because the mean of its divisors is an integer number (266307332).

Almost surely, 2^798921993 is an apocalyptic number.

It is an amenable number.

798921993 is a deficient number, since it is larger than the sum of its proper divisors (266307335).

798921993 is a wasteful number, since it uses less digits than its factorization.

798921993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266307334.

The product of its digits is 2204496, while the sum is 57.

The square root of 798921993 is about 28265.2081718851. The cubic root of 798921993 is about 927.9006071866.

The spelling of 798921993 in words is "seven hundred ninety-eight million, nine hundred twenty-one thousand, nine hundred ninety-three".