819790079 has 4 divisors (see below), whose sum is σ = 820409184. Its totient is φ = 819170976.

The previous prime is 819790057. The next prime is 819790117. The reversal of 819790079 is 970097918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 970097918 = 2 ⋅485048959.

It is a cyclic number.

It is not a de Polignac number, because 819790079 - 2¹² = 819785983 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 (819790579) 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, 307562 + ... + 310215.

It is an arithmetic number, because the mean of its divisors is an integer number (205102296).

Almost surely, 2^819790079 is an apocalyptic number.

819790079 is a deficient number, since it is larger than the sum of its proper divisors (619105).

819790079 is a wasteful number, since it uses less digits than its factorization.

819790079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619104.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 819790079 is about 28631.9765122843. The cubic root of 819790079 is about 935.9102839564.

The spelling of 819790079 in words is "eight hundred nineteen million, seven hundred ninety thousand, seventy-nine".