816382138 has 32 divisors (see below), whose sum is σ = 1444951872. Its totient is φ = 341040000.

The previous prime is 816382123. The next prime is 816382157. The reversal of 816382138 is 831283618.

It is a self number, because there is not a number n which added to its sum of digits gives 816382138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60513 + ... + 72763.

It is an arithmetic number, because the mean of its divisors is an integer number (45154746).

Almost surely, 2^816382138 is an apocalyptic number.

816382138 is a deficient number, since it is larger than the sum of its proper divisors (628569734).

816382138 is a wasteful number, since it uses less digits than its factorization.

816382138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510.

The product of its digits is 55296, while the sum is 40.

The square root of 816382138 is about 28572.4016841427. The cubic root of 816382138 is about 934.6115949939.

The spelling of 816382138 in words is "eight hundred sixteen million, three hundred eighty-two thousand, one hundred thirty-eight".