19992004 has 6 divisors (see below), whose sum is σ = 34986014. Its totient is φ = 9996000.

The previous prime is 19992001. The next prime is 19992029. The reversal of 19992004 is 40029991.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 3992004 = 4000^2 + 1998^2 .

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, 2498997 + ... + 2499004.

Almost surely, 2^19992004 is an apocalyptic number.

It is an amenable number.

19992004 is a deficient number, since it is larger than the sum of its proper divisors (14994010).

19992004 is a wasteful number, since it uses less digits than its factorization.

19992004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998005 (or 4998003 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 19992004 is about 4471.2418856510. The cubic root of 19992004 is about 271.4055826988.

The spelling of 19992004 in words is "nineteen million, nine hundred ninety-two thousand, four".