1999725771 has 8 divisors (see below), whose sum is σ = 2668979344. Its totient is φ = 1331811360.

The previous prime is 1999725733. The next prime is 1999725797. The reversal of 1999725771 is 1775279991.

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

It is not a de Polignac number, because 1999725771 - 2¹³ = 1999717579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999725701) 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, 331300 + ... + 337281.

It is an arithmetic number, because the mean of its divisors is an integer number (333622418).

Almost surely, 2^1999725771 is an apocalyptic number.

1999725771 is a deficient number, since it is larger than the sum of its proper divisors (669253573).

1999725771 is an equidigital number, since it uses as much as digits as its factorization.

1999725771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669581.

The product of its digits is 2500470, while the sum is 57.

The square root of 1999725771 is about 44718.2934714642. The cubic root of 1999725771 is about 1259.8634627812.

The spelling of 1999725771 in words is "one billion, nine hundred ninety-nine million, seven hundred twenty-five thousand, seven hundred seventy-one".