19613813 has 8 divisors (see below), whose sum is σ = 19934208. Its totient is φ = 19295584.

The previous prime is 19613807. The next prime is 19613861. The reversal of 19613813 is 31831691.

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 19613813 - 2⁸ = 19613557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19613813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19613863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31481 + ... + 32097.

It is an arithmetic number, because the mean of its divisors is an integer number (2491776).

Almost surely, 2^19613813 is an apocalyptic number.

It is an amenable number.

19613813 is a deficient number, since it is larger than the sum of its proper divisors (320395).

19613813 is an equidigital number, since it uses as much as digits as its factorization.

19613813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083.

The product of its digits is 3888, while the sum is 32.

The square root of 19613813 is about 4428.7484688115. The cubic root of 19613813 is about 269.6832728658.

The spelling of 19613813 in words is "nineteen million, six hundred thirteen thousand, eight hundred thirteen".