79090399 has 4 divisors (see below), whose sum is σ = 82529136. Its totient is φ = 75651664.

The previous prime is 79090381. The next prime is 79090411. The reversal of 79090399 is 99309097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99309097 = 3533 ⋅28109.

It is a cyclic number.

It is not a de Polignac number, because 79090399 - 2⁵ = 79090367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79090339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1719334 + ... + 1719379.

It is an arithmetic number, because the mean of its divisors is an integer number (20632284).

Almost surely, 2^79090399 is an apocalyptic number.

79090399 is a deficient number, since it is larger than the sum of its proper divisors (3438737).

79090399 is a wasteful number, since it uses less digits than its factorization.

79090399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438736.

The product of its (nonzero) digits is 137781, while the sum is 46.

The square root of 79090399 is about 8893.2783044275. The cubic root of 79090399 is about 429.2476460046.

The spelling of 79090399 in words is "seventy-nine million, ninety thousand, three hundred ninety-nine".