1990000819 has 4 divisors (see below), whose sum is σ = 2000102544. Its totient is φ = 1979899096.

The previous prime is 1990000801. The next prime is 1990000847. The reversal of 1990000819 is 9180000991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1990000819 - 2⁹ = 1990000307 is a prime.

It is a super-3 number, since 3×1990000819³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990000889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5050567 + ... + 5050960.

It is an arithmetic number, because the mean of its divisors is an integer number (500025636).

Almost surely, 2^1990000819 is an apocalyptic number.

1990000819 is a deficient number, since it is larger than the sum of its proper divisors (10101725).

1990000819 is a wasteful number, since it uses less digits than its factorization.

1990000819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10101724.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1990000819 is about 44609.4252260663. The cubic root of 1990000819 is about 1257.8178444984.

The spelling of 1990000819 in words is "one billion, nine hundred ninety million, eight hundred nineteen", and thus it is an aban number.