19985407 has 8 divisors (see below), whose sum is σ = 21615440. Its totient is φ = 18368640.

The previous prime is 19985401. The next prime is 19985417. The reversal of 19985407 is 70458991.

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 19985407 - 2¹⁹ = 19461119 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 (19985401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57 + ... + 6322.

It is an arithmetic number, because the mean of its divisors is an integer number (2701930).

Almost surely, 2^19985407 is an apocalyptic number.

19985407 is a deficient number, since it is larger than the sum of its proper divisors (1630033).

19985407 is a wasteful number, since it uses less digits than its factorization.

19985407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 19985407 is about 4470.5041102766. The cubic root of 19985407 is about 271.3757264356.

The spelling of 19985407 in words is "nineteen million, nine hundred eighty-five thousand, four hundred seven".