19989145 has 8 divisors (see below), whose sum is σ = 26167680. Its totient is φ = 14537520.

The previous prime is 19989131. The next prime is 19989157. The reversal of 19989145 is 54198991.

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

It is not a de Polignac number, because 19989145 - 2⁵ = 19989113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19989095 and 19989104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181665 + ... + 181774.

It is an arithmetic number, because the mean of its divisors is an integer number (3270960).

Almost surely, 2^19989145 is an apocalyptic number.

It is an amenable number.

19989145 is a deficient number, since it is larger than the sum of its proper divisors (6178535).

19989145 is a wasteful number, since it uses less digits than its factorization.

19989145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363455.

The product of its digits is 116640, while the sum is 46.

The square root of 19989145 is about 4470.9221643862. The cubic root of 19989145 is about 271.3926444336.

The spelling of 19989145 in words is "nineteen million, nine hundred eighty-nine thousand, one hundred forty-five".