816271438 has 4 divisors (see below), whose sum is σ = 1224407160. Its totient is φ = 408135718.

The previous prime is 816271411. The next prime is 816271441. The reversal of 816271438 is 834172618.

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

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 self number, because there is not a number n which added to its sum of digits gives 816271438.

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, 204067858 + ... + 204067861.

It is an arithmetic number, because the mean of its divisors is an integer number (306101790).

Almost surely, 2^816271438 is an apocalyptic number.

816271438 is a deficient number, since it is larger than the sum of its proper divisors (408135722).

816271438 is a wasteful number, since it uses less digits than its factorization.

816271438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408135721.

The product of its digits is 64512, while the sum is 40.

The square root of 816271438 is about 28570.4644344470. The cubic root of 816271438 is about 934.5693491814.

The spelling of 816271438 in words is "eight hundred sixteen million, two hundred seventy-one thousand, four hundred thirty-eight".