819008842 has 4 divisors (see below), whose sum is σ = 1228513266. Its totient is φ = 409504420.

The previous prime is 819008837. The next prime is 819008843. The reversal of 819008842 is 248800918.

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

It can be written as a sum of positive squares in only one way, i.e., 677612961 + 141395881 = 26031^2 + 11891^2 .

It is a junction number, because it is equal to n+sod(n) for n = 819008795 and 819008804.

It is not an unprimeable number, because it can be changed into a prime (819008843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204752209 + ... + 204752212.

Almost surely, 2^819008842 is an apocalyptic number.

819008842 is a deficient number, since it is larger than the sum of its proper divisors (409504424).

819008842 is a wasteful number, since it uses less digits than its factorization.

819008842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409504423.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 819008842 is about 28618.3305243335. The cubic root of 819008842 is about 935.6128906988.

The spelling of 819008842 in words is "eight hundred nineteen million, eight thousand, eight hundred forty-two".