812749930 has 8 divisors (see below), whose sum is σ = 1462949892. Its totient is φ = 325099968.

The previous prime is 812749921. The next prime is 812749937. The reversal of 812749930 is 39947218.

It can be written as a sum of positive squares in 2 ways, for example, as 810597841 + 2152089 = 28471^2 + 1467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (812749937) 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 3 ways as a sum of consecutive naturals, for example, 40637487 + ... + 40637506.

Almost surely, 2^812749930 is an apocalyptic number.

812749930 is a deficient number, since it is larger than the sum of its proper divisors (650199962).

812749930 is a wasteful number, since it uses less digits than its factorization.

812749930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81275000.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 812749930 is about 28508.7693526045. The cubic root of 812749930 is about 933.2234580123.

It can be divided in two parts, 81274 and 9930, that added together give a square (91204 = 302²).

The spelling of 812749930 in words is "eight hundred twelve million, seven hundred forty-nine thousand, nine hundred thirty".