79206409 has 4 divisors (see below), whose sum is σ = 79257604. Its totient is φ = 79155216.

The previous prime is 79206403. The next prime is 79206419. The reversal of 79206409 is 90460297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90460297 = 797 ⋅113501.

It can be written as a sum of positive squares in 2 ways, for example, as 8982009 + 70224400 = 2997^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 79206409 - 2³ = 79206401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79206401) 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, 23202 + ... + 26395.

It is an arithmetic number, because the mean of its divisors is an integer number (19814401).

Almost surely, 2^79206409 is an apocalyptic number.

It is an amenable number.

79206409 is a deficient number, since it is larger than the sum of its proper divisors (51195).

79206409 is a wasteful number, since it uses less digits than its factorization.

79206409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51194.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 79206409 is about 8899.7982561404. The cubic root of 79206409 is about 429.4574173228.

The spelling of 79206409 in words is "seventy-nine million, two hundred six thousand, four hundred nine".