812149389 has 16 divisors (see below), whose sum is σ = 1255497600. Its totient is φ = 517891968.

The previous prime is 812149363. The next prime is 812149399. The reversal of 812149389 is 983941218.

812149389 is a `hidden beast` number, since 81 + 2 + 1 + 493 + 89 = 666.

It is not a de Polignac number, because 812149389 - 2⁹ = 812148877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812149399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653284 + ... + 654525.

It is an arithmetic number, because the mean of its divisors is an integer number (78468600).

Almost surely, 2^812149389 is an apocalyptic number.

It is an amenable number.

812149389 is a deficient number, since it is larger than the sum of its proper divisors (443348211).

812149389 is a wasteful number, since it uses less digits than its factorization.

812149389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307841 (or 1307835 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 812149389 is about 28498.2348400739. The cubic root of 812149389 is about 932.9935484092.

The spelling of 812149389 in words is "eight hundred twelve million, one hundred forty-nine thousand, three hundred eighty-nine".