812557838 has 8 divisors (see below), whose sum is σ = 1282986120. Its totient is φ = 384895800.

The previous prime is 812557783. The next prime is 812557847. The reversal of 812557838 is 838755218.

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 = 812557792 and 812557801.

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, 10691513 + ... + 10691588.

It is an arithmetic number, because the mean of its divisors is an integer number (160373265).

Almost surely, 2^812557838 is an apocalyptic number.

812557838 is a deficient number, since it is larger than the sum of its proper divisors (470428282).

812557838 is a wasteful number, since it uses less digits than its factorization.

812557838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21383122.

The product of its digits is 537600, while the sum is 47.

The square root of 812557838 is about 28505.4001550583. The cubic root of 812557838 is about 933.1499303180.

The spelling of 812557838 in words is "eight hundred twelve million, five hundred fifty-seven thousand, eight hundred thirty-eight".