19397109 has 4 divisors (see below), whose sum is σ = 25862816. Its totient is φ = 12931404.

The previous prime is 19397093. The next prime is 19397111. The reversal of 19397109 is 90179391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90179391 = 3 ⋅30059797.

It is not a de Polignac number, because 19397109 - 2⁴ = 19397093 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 (19397179) 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 3 ways as a sum of consecutive naturals, for example, 3232849 + ... + 3232854.

It is an arithmetic number, because the mean of its divisors is an integer number (6465704).

Almost surely, 2^19397109 is an apocalyptic number.

It is an amenable number.

19397109 is a deficient number, since it is larger than the sum of its proper divisors (6465707).

19397109 is an equidigital number, since it uses as much as digits as its factorization.

19397109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465706.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 19397109 is about 4404.2149130123. The cubic root of 19397109 is about 268.6863902818.

The spelling of 19397109 in words is "nineteen million, three hundred ninety-seven thousand, one hundred nine".