79404289 has 4 divisors (see below), whose sum is σ = 79450180. Its totient is φ = 79358400.

The previous prime is 79404223. The next prime is 79404293. The reversal of 79404289 is 98240497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98240497 = 7057 ⋅13921.

It can be written as a sum of positive squares in 2 ways, for example, as 21902400 + 57501889 = 4680^2 + 7583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79404289 is a prime.

It is a super-2 number, since 2×79404289² = 12610082223191042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79404889) 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, 20244 + ... + 23845.

It is an arithmetic number, because the mean of its divisors is an integer number (19862545).

Almost surely, 2^79404289 is an apocalyptic number.

It is an amenable number.

79404289 is a deficient number, since it is larger than the sum of its proper divisors (45891).

79404289 is a wasteful number, since it uses less digits than its factorization.

79404289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45890.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 79404289 is about 8910.9084273154. The cubic root of 79404289 is about 429.8147552537.

The spelling of 79404289 in words is "seventy-nine million, four hundred four thousand, two hundred eighty-nine".