19990089 has 18 divisors (see below), whose sum is σ = 33589530. Its totient is φ = 11422656.

The previous prime is 19990057. The next prime is 19990093. The reversal of 19990089 is 98009991.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 2350089 = 4200^2 + 1533^2 .

It is not a de Polignac number, because 19990089 - 2⁵ = 19990057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19990049) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22224 + ... + 23105.

It is an arithmetic number, because the mean of its divisors is an integer number (1866085).

Almost surely, 2^19990089 is an apocalyptic number.

It is an amenable number.

19990089 is a deficient number, since it is larger than the sum of its proper divisors (13599441).

19990089 is a wasteful number, since it uses less digits than its factorization.

19990089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45349 (or 45339 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 19990089 is about 4471.0277342016. The cubic root of 19990089 is about 271.3969165960.

The spelling of 19990089 in words is "nineteen million, nine hundred ninety thousand, eighty-nine".