19018989 has 16 divisors (see below), whose sum is σ = 30738240. Its totient is φ = 11526480.

The previous prime is 19018963. The next prime is 19018991. The reversal of 19018989 is 98981091.

It is not a de Polignac number, because 19018989 - 2¹⁹ = 18494701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19018919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31722 + ... + 32315.

It is an arithmetic number, because the mean of its divisors is an integer number (1921140).

Almost surely, 2^19018989 is an apocalyptic number.

It is an amenable number.

19018989 is a deficient number, since it is larger than the sum of its proper divisors (11719251).

19018989 is a wasteful number, since it uses less digits than its factorization.

19018989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64057 (or 64051 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 19018989 is about 4361.0765872660. The cubic root of 19018989 is about 266.9290305002.

The spelling of 19018989 in words is "nineteen million, eighteen thousand, nine hundred eighty-nine".