812665238 has 32 divisors (see below), whose sum is σ = 1522015488. Its totient is φ = 316159200.

The previous prime is 812665237. The next prime is 812665261. The reversal of 812665238 is 832566218.

It is a junction number, because it is equal to n+sod(n) for n = 812665195 and 812665204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812665237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113093 + ... + 120063.

It is an arithmetic number, because the mean of its divisors is an integer number (47562984).

Almost surely, 2^812665238 is an apocalyptic number.

812665238 is a deficient number, since it is larger than the sum of its proper divisors (709350250).

812665238 is a wasteful number, since it uses less digits than its factorization.

812665238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7748.

The product of its digits is 138240, while the sum is 41.

The square root of 812665238 is about 28507.2839463882. The cubic root of 812665238 is about 933.1910416016.

The spelling of 812665238 in words is "eight hundred twelve million, six hundred sixty-five thousand, two hundred thirty-eight".