1990323812 has 6 divisors (see below), whose sum is σ = 3483066678. Its totient is φ = 995161904.

The previous prime is 1990323781. The next prime is 1990323817. The reversal of 1990323812 is 2183230991.

It can be written as a sum of positive squares in only one way, i.e., 1854508096 + 135815716 = 43064^2 + 11654^2 .

It is a super-3 number, since 3×1990323812³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1990323817) 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 as a sum of consecutive naturals, namely, 248790473 + ... + 248790480.

It is an arithmetic number, because the mean of its divisors is an integer number (580511113).

Almost surely, 2^1990323812 is an apocalyptic number.

It is an amenable number.

1990323812 is a deficient number, since it is larger than the sum of its proper divisors (1492742866).

1990323812 is a wasteful number, since it uses less digits than its factorization.

1990323812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497580957 (or 497580955 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1990323812 is about 44613.0453118816. The cubic root of 1990323812 is about 1257.8858921054.

The spelling of 1990323812 in words is "one billion, nine hundred ninety million, three hundred twenty-three thousand, eight hundred twelve".