819980427 has 8 divisors (see below), whose sum is σ = 1249494016. Its totient is φ = 468560232.

The previous prime is 819980419. The next prime is 819980467. The reversal of 819980427 is 724089918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 819980427 - 2³ = 819980419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819980417) 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 7 ways as a sum of consecutive naturals, for example, 19523323 + ... + 19523364.

It is an arithmetic number, because the mean of its divisors is an integer number (156186752).

Almost surely, 2^819980427 is an apocalyptic number.

819980427 is a deficient number, since it is larger than the sum of its proper divisors (429513589).

819980427 is a wasteful number, since it uses less digits than its factorization.

819980427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39046697.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 819980427 is about 28635.3003651088. The cubic root of 819980427 is about 935.9827150453.

The spelling of 819980427 in words is "eight hundred nineteen million, nine hundred eighty thousand, four hundred twenty-seven".