79801409 has 4 divisors (see below), whose sum is σ = 82375680. Its totient is φ = 77227140.

The previous prime is 79801399. The next prime is 79801433. The reversal of 79801409 is 90410897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90410897 = 43 ⋅2102579.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79801409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79801439) 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, 1287089 + ... + 1287150.

It is an arithmetic number, because the mean of its divisors is an integer number (20593920).

Almost surely, 2^79801409 is an apocalyptic number.

It is an amenable number.

79801409 is a deficient number, since it is larger than the sum of its proper divisors (2574271).

79801409 is a wasteful number, since it uses less digits than its factorization.

79801409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574270.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 79801409 is about 8933.1634374392. The cubic root of 79801409 is about 430.5300997901.

The spelling of 79801409 in words is "seventy-nine million, eight hundred one thousand, four hundred nine".