19380813 has 8 divisors (see below), whose sum is σ = 25868928. Its totient is φ = 12906624.

The previous prime is 19380793. The next prime is 19380821. The reversal of 19380813 is 31808391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19380813 - 2¹² = 19376717 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19380883) 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, 381 + ... + 6237.

It is an arithmetic number, because the mean of its divisors is an integer number (3233616).

Almost surely, 2^19380813 is an apocalyptic number.

It is an amenable number.

19380813 is a deficient number, since it is larger than the sum of its proper divisors (6488115).

19380813 is a wasteful number, since it uses less digits than its factorization.

19380813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6963.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 19380813 is about 4402.3644783230. The cubic root of 19380813 is about 268.6111257986.

The spelling of 19380813 in words is "nineteen million, three hundred eighty thousand, eight hundred thirteen".