19397641 has 4 divisors (see below), whose sum is σ = 19441872. Its totient is φ = 19353412.

The previous prime is 19397617. The next prime is 19397683. The reversal of 19397641 is 14679391.

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: 14679391 = 677 ⋅21683.

It is a cyclic number.

It is not a de Polignac number, because 19397641 - 2⁷ = 19397513 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19397594 and 19397603.

It is not an unprimeable number, because it can be changed into a prime (19398641) 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 3 ways as a sum of consecutive naturals, for example, 21451 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (4860468).

Almost surely, 2^19397641 is an apocalyptic number.

It is an amenable number.

19397641 is a deficient number, since it is larger than the sum of its proper divisors (44231).

19397641 is an equidigital number, since it uses as much as digits as its factorization.

19397641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44230.

The product of its digits is 40824, while the sum is 40.

The square root of 19397641 is about 4404.2753092876. The cubic root of 19397641 is about 268.6888466591.

The spelling of 19397641 in words is "nineteen million, three hundred ninety-seven thousand, six hundred forty-one".