19992002 has 4 divisors (see below), whose sum is σ = 29988006. Its totient is φ = 9996000.

The previous prime is 19992001. The next prime is 19992029. The reversal of 19992002 is 20029991.

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

It can be written as a sum of positive squares in only one way, i.e., 12033961 + 7958041 = 3469^2 + 2821^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19992002.

It is not an unprimeable number, because it can be changed into a prime (19992001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997999 + ... + 4998002.

Almost surely, 2^19992002 is an apocalyptic number.

19992002 is a deficient number, since it is larger than the sum of its proper divisors (9996004).

19992002 is an equidigital number, since it uses as much as digits as its factorization.

19992002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9996003.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 19992002 is about 4471.2416619995. The cubic root of 19992002 is about 271.4055736484.

The spelling of 19992002 in words is "nineteen million, nine hundred ninety-two thousand, two".