79990189 has 4 divisors (see below), whose sum is σ = 82152124. Its totient is φ = 77828256.

The previous prime is 79990187. The next prime is 79990217. The reversal of 79990189 is 98109997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58293225 + 21696964 = 7635^2 + 4658^2 .

It is a cyclic number.

It is not a de Polignac number, because 79990189 - 2¹ = 79990187 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 (79990187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080912 + ... + 1080985.

It is an arithmetic number, because the mean of its divisors is an integer number (20538031).

Almost surely, 2^79990189 is an apocalyptic number.

It is an amenable number.

79990189 is a deficient number, since it is larger than the sum of its proper divisors (2161935).

79990189 is a wasteful number, since it uses less digits than its factorization.

79990189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161934.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 79990189 is about 8943.7234416098. The cubic root of 79990189 is about 430.8693229873.

The spelling of 79990189 in words is "seventy-nine million, nine hundred ninety thousand, one hundred eighty-nine".