79217387 has 4 divisors (see below), whose sum is σ = 80107560. Its totient is φ = 78327216.

The previous prime is 79217363. The next prime is 79217401. The reversal of 79217387 is 78371297.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79217387 - 2¹⁸ = 78955243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79217287) 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, 444953 + ... + 445130.

It is an arithmetic number, because the mean of its divisors is an integer number (20026890).

Almost surely, 2^79217387 is an apocalyptic number.

79217387 is a deficient number, since it is larger than the sum of its proper divisors (890173).

79217387 is an equidigital number, since it uses as much as digits as its factorization.

79217387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890172.

The product of its digits is 148176, while the sum is 44.

The square root of 79217387 is about 8900.4149903249. The cubic root of 79217387 is about 429.4772573239.

The spelling of 79217387 in words is "seventy-nine million, two hundred seventeen thousand, three hundred eighty-seven".