820079387 has 4 divisors (see below), whose sum is σ = 863241480. Its totient is φ = 776917296.

The previous prime is 820079383. The next prime is 820079399. The reversal of 820079387 is 783970028.

It is a happy number.

820079387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 820079387 - 2² = 820079383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820079383) 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, 21581018 + ... + 21581055.

It is an arithmetic number, because the mean of its divisors is an integer number (215810370).

Almost surely, 2^820079387 is an apocalyptic number.

820079387 is a deficient number, since it is larger than the sum of its proper divisors (43162093).

820079387 is a wasteful number, since it uses less digits than its factorization.

820079387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43162092.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 820079387 is about 28637.0282501519. The cubic root of 820079387 is about 936.0203668073.

The spelling of 820079387 in words is "eight hundred twenty million, seventy-nine thousand, three hundred eighty-seven".