829987812 has 36 divisors (see below), whose sum is σ = 2112119100. Its totient is φ = 274804032.

The previous prime is 829987793. The next prime is 829987817. The reversal of 829987812 is 218789928.

It can be written as a sum of positive squares in 2 ways, for example, as 214153956 + 615833856 = 14634^2 + 24816^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (829987817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72003 + ... + 82730.

It is an arithmetic number, because the mean of its divisors is an integer number (58669975).

Almost surely, 2^829987812 is an apocalyptic number.

It is an amenable number.

829987812 is an abundant number, since it is smaller than the sum of its proper divisors (1282131288).

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

829987812 is a wasteful number, since it uses less digits than its factorization.

829987812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154892 (or 154887 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 829987812 is about 28809.5090551713. The cubic root of 829987812 is about 939.7750374590.

The spelling of 829987812 in words is "eight hundred twenty-nine million, nine hundred eighty-seven thousand, eight hundred twelve".