812255013940 has 12 divisors (see below), whose sum is σ = 1705735529316. Its totient is φ = 324902005568.

The previous prime is 812255013863. The next prime is 812255013943. The reversal of 812255013940 is 49310552218.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 599686067236 + 212568946704 = 774394^2 + 461052^2 .

It is a junction number, because it is equal to n+sod(n) for n = 812255013893 and 812255013902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812255013943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20306375329 + ... + 20306375368.

It is an arithmetic number, because the mean of its divisors is an integer number (142144627443).

Almost surely, 2^812255013940 is an apocalyptic number.

It is an amenable number.

812255013940 is an abundant number, since it is smaller than the sum of its proper divisors (893480515376).

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

812255013940 is a wasteful number, since it uses less digits than its factorization.

812255013940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40612750706 (or 40612750704 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 812255013940 in words is "eight hundred twelve billion, two hundred fifty-five million, thirteen thousand, nine hundred forty".