79197905 has 4 divisors (see below), whose sum is σ = 95037492. Its totient is φ = 63358320.

The previous prime is 79197893. The next prime is 79197907. The reversal of 79197905 is 50979197.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50979197 = 127 ⋅401411.

It can be written as a sum of positive squares in 2 ways, for example, as 10523536 + 68674369 = 3244^2 + 8287^2 .

It is not a de Polignac number, because 79197905 - 2¹⁴ = 79181521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79197905.

It is not an unprimeable number, because it can be changed into a prime (79197907) 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, 7919786 + ... + 7919795.

It is an arithmetic number, because the mean of its divisors is an integer number (23759373).

Almost surely, 2^79197905 is an apocalyptic number.

It is an amenable number.

79197905 is a deficient number, since it is larger than the sum of its proper divisors (15839587).

79197905 is a wasteful number, since it uses less digits than its factorization.

79197905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15839586.

The product of its (nonzero) digits is 178605, while the sum is 47.

The square root of 79197905 is about 8899.3204796771. The cubic root of 79197905 is about 429.4420472004.

The spelling of 79197905 in words is "seventy-nine million, one hundred ninety-seven thousand, nine hundred five".