818665238 has 8 divisors (see below), whose sum is σ = 1248811560. Its totient is φ = 402394720.

The previous prime is 818665139. The next prime is 818665247. The reversal of 818665238 is 832566818.

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

It is a junction number, because it is equal to n+sod(n) for n = 818665192 and 818665201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3468803 + ... + 3469038.

It is an arithmetic number, because the mean of its divisors is an integer number (156101445).

Almost surely, 2^818665238 is an apocalyptic number.

818665238 is a deficient number, since it is larger than the sum of its proper divisors (430146322).

818665238 is a wasteful number, since it uses less digits than its factorization.

818665238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6937902.

The product of its digits is 552960, while the sum is 47.

The square root of 818665238 is about 28612.3266792479. The cubic root of 818665238 is about 935.4820311838.

The spelling of 818665238 in words is "eight hundred eighteen million, six hundred sixty-five thousand, two hundred thirty-eight".