1992047809 has 8 divisors (see below), whose sum is σ = 2007427968. Its totient is φ = 1976716080.

The previous prime is 1992047803. The next prime is 1992047851. The reversal of 1992047809 is 9087402991.

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

It is a cyclic number.

It is not a de Polignac number, because 1992047809 - 2¹¹ = 1992045761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992047803) 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 in 7 ways as a sum of consecutive naturals, for example, 72744 + ... + 96310.

It is an arithmetic number, because the mean of its divisors is an integer number (250928496).

Almost surely, 2^1992047809 is an apocalyptic number.

It is an amenable number.

1992047809 is a deficient number, since it is larger than the sum of its proper divisors (15380159).

1992047809 is a wasteful number, since it uses less digits than its factorization.

1992047809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24215.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1992047809 is about 44632.3627987585. The cubic root of 1992047809 is about 1258.2489763526.

The spelling of 1992047809 in words is "one billion, nine hundred ninety-two million, forty-seven thousand, eight hundred nine".