79539389 has 4 divisors (see below), whose sum is σ = 80433180. Its totient is φ = 78645600.

The previous prime is 79539349. The next prime is 79539391. The reversal of 79539389 is 98393597.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98393597 = 31 ⋅3173987.

It can be written as a sum of positive squares in 2 ways, for example, as 55204900 + 24334489 = 7430^2 + 4933^2 .

It is a cyclic number.

It is not a de Polignac number, because 79539389 - 2¹² = 79535293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79539389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79539319) 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, 446762 + ... + 446939.

It is an arithmetic number, because the mean of its divisors is an integer number (20108295).

Almost surely, 2^79539389 is an apocalyptic number.

It is an amenable number.

79539389 is a deficient number, since it is larger than the sum of its proper divisors (893791).

79539389 is an equidigital number, since it uses as much as digits as its factorization.

79539389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893790.

The product of its digits is 1837080, while the sum is 53.

The square root of 79539389 is about 8918.4858019733. The cubic root of 79539389 is about 430.0583821937.

The spelling of 79539389 in words is "seventy-nine million, five hundred thirty-nine thousand, three hundred eighty-nine".