19840013 has 8 divisors (see below), whose sum is σ = 20189568. Its totient is φ = 19492704.

The previous prime is 19839997. The next prime is 19840019. The reversal of 19840013 is 31004891.

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 19840013 - 2⁴ = 19839997 is a prime.

It is a super-2 number, since 2×19840013² = 787252231680338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19840019) 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, 33506 + ... + 34092.

It is an arithmetic number, because the mean of its divisors is an integer number (2523696).

Almost surely, 2^19840013 is an apocalyptic number.

It is an amenable number.

19840013 is a deficient number, since it is larger than the sum of its proper divisors (349555).

19840013 is an equidigital number, since it uses as much as digits as its factorization.

19840013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 19840013 is about 4454.2129495569. The cubic root of 19840013 is about 270.7160372124.

The spelling of 19840013 in words is "nineteen million, eight hundred forty thousand, thirteen".