79897409 has 8 divisors (see below), whose sum is σ = 80987712. Its totient is φ = 78813360.

The previous prime is 79897379. The next prime is 79897421. The reversal of 79897409 is 90479897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79897409 - 2²⁴ = 63120193 is a prime.

It is a super-3 number, since 3×79897409³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79897429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27779 + ... + 30519.

It is an arithmetic number, because the mean of its divisors is an integer number (10123464).

Almost surely, 2^79897409 is an apocalyptic number.

It is an amenable number.

79897409 is a deficient number, since it is larger than the sum of its proper divisors (1090303).

79897409 is a wasteful number, since it uses less digits than its factorization.

79897409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 79897409 is about 8938.5350589456. The cubic root of 79897409 is about 430.7026712090.

The spelling of 79897409 in words is "seventy-nine million, eight hundred ninety-seven thousand, four hundred nine".