820899146 has 12 divisors (see below), whose sum is σ = 1235828022. Its totient is φ = 408958944.

The previous prime is 820899119. The next prime is 820899151. The reversal of 820899146 is 641998028.

It can be written as a sum of positive squares in 3 ways, for example, as 811965025 + 8934121 = 28495^2 + 2989^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 820899146.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 782030 + ... + 783078.

Almost surely, 2^820899146 is an apocalyptic number.

820899146 is a deficient number, since it is larger than the sum of its proper divisors (414928876).

820899146 is an equidigital number, since it uses as much as digits as its factorization.

820899146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 820899146 is about 28651.3375953026. The cubic root of 820899146 is about 936.3321478387.

The spelling of 820899146 in words is "eight hundred twenty million, eight hundred ninety-nine thousand, one hundred forty-six".