812187004 has 12 divisors (see below), whose sum is σ = 1424874528. Its totient is φ = 405080000.

The previous prime is 812186993. The next prime is 812187007. The reversal of 812187004 is 400781218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812187007) 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 3 ways as a sum of consecutive naturals, for example, 251572 + ... + 254779.

It is an arithmetic number, because the mean of its divisors is an integer number (118739544).

Almost surely, 2^812187004 is an apocalyptic number.

It is an amenable number.

812187004 is a deficient number, since it is larger than the sum of its proper divisors (612687524).

812187004 is a wasteful number, since it uses less digits than its factorization.

812187004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506756 (or 506754 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 812187004 is about 28498.8947855877. The cubic root of 812187004 is about 933.0079521675.

The spelling of 812187004 in words is "eight hundred twelve million, one hundred eighty-seven thousand, four".