19489939 has 8 divisors (see below), whose sum is σ = 23584608. Its totient is φ = 15722880.

The previous prime is 19489937. The next prime is 19489999. The reversal of 19489939 is 93998491.

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

It is a cyclic number.

It is not a de Polignac number, because 19489939 - 2¹ = 19489937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19489931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81772 + ... + 82009.

It is an arithmetic number, because the mean of its divisors is an integer number (2948076).

Almost surely, 2^19489939 is an apocalyptic number.

19489939 is a deficient number, since it is larger than the sum of its proper divisors (4094669).

19489939 is a wasteful number, since it uses less digits than its factorization.

19489939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163805.

The product of its digits is 629856, while the sum is 52.

The square root of 19489939 is about 4414.7411022618. The cubic root of 19489939 is about 269.1143316134.

The spelling of 19489939 in words is "nineteen million, four hundred eighty-nine thousand, nine hundred thirty-nine".