819109238 has 16 divisors (see below), whose sum is σ = 1244784240. Its totient is φ = 404191776.

The previous prime is 819109231. The next prime is 819109243. The reversal of 819109238 is 832901918.

It is a junction number, because it is equal to n+sod(n) for n = 819109195 and 819109204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819109231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203348 + ... + 207336.

It is an arithmetic number, because the mean of its divisors is an integer number (77799015).

Almost surely, 2^819109238 is an apocalyptic number.

819109238 is a deficient number, since it is larger than the sum of its proper divisors (425675002).

819109238 is a wasteful number, since it uses less digits than its factorization.

819109238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 819109238 is about 28620.0845211890. The cubic root of 819109238 is about 935.6511190016.

The spelling of 819109238 in words is "eight hundred nineteen million, one hundred nine thousand, two hundred thirty-eight".