19943409 has 8 divisors (see below), whose sum is σ = 26840160. Its totient is φ = 13171136.

The previous prime is 19943389. The next prime is 19943411. The reversal of 19943409 is 90434991.

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 19943409 - 2¹² = 19939313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19943419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30744 + ... + 31385.

It is an arithmetic number, because the mean of its divisors is an integer number (3355020).

Almost surely, 2^19943409 is an apocalyptic number.

It is an amenable number.

19943409 is a deficient number, since it is larger than the sum of its proper divisors (6896751).

19943409 is a wasteful number, since it uses less digits than its factorization.

19943409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62239.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 19943409 is about 4465.8044068230. The cubic root of 19943409 is about 271.1855004604.

The spelling of 19943409 in words is "nineteen million, nine hundred forty-three thousand, four hundred nine".