79821382 has 4 divisors (see below), whose sum is σ = 119732076. Its totient is φ = 39910690.

The previous prime is 79821353. The next prime is 79821407. The reversal of 79821382 is 28312897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28312897 = 5309 ⋅5333.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19955344 + ... + 19955347.

It is an arithmetic number, because the mean of its divisors is an integer number (29933019).

Almost surely, 2^79821382 is an apocalyptic number.

79821382 is a deficient number, since it is larger than the sum of its proper divisors (39910694).

79821382 is a wasteful number, since it uses less digits than its factorization.

79821382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39910693.

The product of its digits is 48384, while the sum is 40.

The square root of 79821382 is about 8934.2812805508. The cubic root of 79821382 is about 430.5660150306.

The spelling of 79821382 in words is "seventy-nine million, eight hundred twenty-one thousand, three hundred eighty-two".