812991238 has 8 divisors (see below), whose sum is σ = 1291221432. Its totient is φ = 382584096.

The previous prime is 812991227. The next prime is 812991271. The reversal of 812991238 is 832199218.

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 = 812991194 and 812991203.

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, 11955720 + ... + 11955787.

It is an arithmetic number, because the mean of its divisors is an integer number (161402679).

Almost surely, 2^812991238 is an apocalyptic number.

812991238 is a deficient number, since it is larger than the sum of its proper divisors (478230194).

812991238 is a wasteful number, since it uses less digits than its factorization.

812991238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23911526.

The product of its digits is 62208, while the sum is 43.

The square root of 812991238 is about 28513.0012099744. The cubic root of 812991238 is about 933.3158078625.

The spelling of 812991238 in words is "eight hundred twelve million, nine hundred ninety-one thousand, two hundred thirty-eight".