812256340 has 36 divisors (see below), whose sum is σ = 1984228596. Its totient is φ = 278487552.

The previous prime is 812256329. The next prime is 812256349. The reversal of 812256340 is 43652218.

It can be written as a sum of positive squares in 2 ways, for example, as 160883856 + 651372484 = 12684^2 + 25522^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812256349) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 413437 + ... + 415396.

It is an arithmetic number, because the mean of its divisors is an integer number (55117461).

Almost surely, 2^812256340 is an apocalyptic number.

It is an amenable number.

812256340 is an abundant number, since it is smaller than the sum of its proper divisors (1171972256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812256340 is a wasteful number, since it uses less digits than its factorization.

812256340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828856 (or 828847 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 812256340 is about 28500.1112278531. Note that the first 3 decimals coincide. The cubic root of 812256340 is about 933.0345015534.

The spelling of 812256340 in words is "eight hundred twelve million, two hundred fifty-six thousand, three hundred forty".