79809143 has 4 divisors (see below), whose sum is σ = 79833960. Its totient is φ = 79784328.

The previous prime is 79809137. The next prime is 79809173. The reversal of 79809143 is 34190897.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 79809143 - 2¹⁰ = 79808119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79809143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79809173) 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, 6713 + ... + 14306.

It is an arithmetic number, because the mean of its divisors is an integer number (19958490).

Almost surely, 2^79809143 is an apocalyptic number.

79809143 is a deficient number, since it is larger than the sum of its proper divisors (24817).

79809143 is a wasteful number, since it uses less digits than its factorization.

79809143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24816.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 79809143 is about 8933.5963083184. The cubic root of 79809143 is about 430.5440076992.

The spelling of 79809143 in words is "seventy-nine million, eight hundred nine thousand, one hundred forty-three".