19939189 has 16 divisors (see below), whose sum is σ = 21833280. Its totient is φ = 18144000.

The previous prime is 19939187. The next prime is 19939193. The reversal of 19939189 is 98193991.

It is a cyclic number.

It is not a de Polignac number, because 19939189 - 2¹ = 19939187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19939187) 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, 79314 + ... + 79564.

It is an arithmetic number, because the mean of its divisors is an integer number (1364580).

Almost surely, 2^19939189 is an apocalyptic number.

19939189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19939189 is a deficient number, since it is larger than the sum of its proper divisors (1894091).

19939189 is a wasteful number, since it uses less digits than its factorization.

19939189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 157464, while the sum is 49.

The square root of 19939189 is about 4465.3319025577. The cubic root of 19939189 is about 271.1663716087.

The spelling of 19939189 in words is "nineteen million, nine hundred thirty-nine thousand, one hundred eighty-nine".