19960399 has 4 divisors (see below), whose sum is σ = 20447280. Its totient is φ = 19473520.

The previous prime is 19960379. The next prime is 19960403. The reversal of 19960399 is 99306991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19960399 - 2⁷ = 19960271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19960309) 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 3 ways as a sum of consecutive naturals, for example, 243379 + ... + 243460.

It is an arithmetic number, because the mean of its divisors is an integer number (5111820).

Almost surely, 2^19960399 is an apocalyptic number.

19960399 is a deficient number, since it is larger than the sum of its proper divisors (486881).

19960399 is an equidigital number, since it uses as much as digits as its factorization.

19960399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486880.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 19960399 is about 4467.7062347473. The cubic root of 19960399 is about 271.2624871965.

The spelling of 19960399 in words is "nineteen million, nine hundred sixty thousand, three hundred ninety-nine".