812865402 has 48 divisors (see below), whose sum is σ = 1887238080. Its totient is φ = 258854112.

The previous prime is 812865371. The next prime is 812865407. The reversal of 812865402 is 204568218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812865407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1004374 + ... + 1005182.

It is an arithmetic number, because the mean of its divisors is an integer number (39317460).

Almost surely, 2^812865402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812865402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943619040).

812865402 is an abundant number, since it is smaller than the sum of its proper divisors (1074372678).

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

812865402 is an equidigital number, since it uses as much as digits as its factorization.

812865402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 812865402 is about 28510.7944820905. The cubic root of 812865402 is about 933.2676520389.

The spelling of 812865402 in words is "eight hundred twelve million, eight hundred sixty-five thousand, four hundred two".