19338397 has 4 divisors (see below), whose sum is σ = 20825980. Its totient is φ = 17850816.

The previous prime is 19338379. The next prime is 19338421. The reversal of 19338397 is 79383391.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3767481 + 15570916 = 1941^2 + 3946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19338397 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 (19338317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743772 + ... + 743797.

It is an arithmetic number, because the mean of its divisors is an integer number (5206495).

Almost surely, 2^19338397 is an apocalyptic number.

It is an amenable number.

19338397 is a deficient number, since it is larger than the sum of its proper divisors (1487583).

19338397 is a wasteful number, since it uses less digits than its factorization.

19338397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487582.

The product of its digits is 122472, while the sum is 43.

The square root of 19338397 is about 4397.5444284282. The cubic root of 19338397 is about 268.4150258149.

The spelling of 19338397 in words is "nineteen million, three hundred thirty-eight thousand, three hundred ninety-seven".