1999242505 has 8 divisors (see below), whose sum is σ = 2583636552. Its totient is φ = 1476363648.

The previous prime is 1999242503. The next prime is 1999242527. The reversal of 1999242505 is 5052429991.

It can be written as a sum of positive squares in 4 ways, for example, as 172449424 + 1826793081 = 13132^2 + 42741^2 .

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 1999242505 - 2¹ = 1999242503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999242503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15378724 + ... + 15378853.

It is an arithmetic number, because the mean of its divisors is an integer number (322954569).

Almost surely, 2^1999242505 is an apocalyptic number.

It is an amenable number.

1999242505 is a deficient number, since it is larger than the sum of its proper divisors (584394047).

1999242505 is a wasteful number, since it uses less digits than its factorization.

1999242505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30757595.

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 1999242505 is about 44712.8896963728. The cubic root of 1999242505 is about 1259.7619658263.

The spelling of 1999242505 in words is "one billion, nine hundred ninety-nine million, two hundred forty-two thousand, five hundred five".