19381641 has 4 divisors (see below), whose sum is σ = 25842192. Its totient is φ = 12921092.

The previous prime is 19381633. The next prime is 19381669. The reversal of 19381641 is 14618391.

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.

It is a cyclic number.

It is not a de Polignac number, because 19381641 - 2³ = 19381633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19381601) 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, 3230271 + ... + 3230276.

It is an arithmetic number, because the mean of its divisors is an integer number (6460548).

Almost surely, 2^19381641 is an apocalyptic number.

It is an amenable number.

19381641 is a deficient number, since it is larger than the sum of its proper divisors (6460551).

19381641 is an equidigital number, since it uses as much as digits as its factorization.

19381641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460550.

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

The square root of 19381641 is about 4402.4585176921. The cubic root of 19381641 is about 268.6149510052.

The spelling of 19381641 in words is "nineteen million, three hundred eighty-one thousand, six hundred forty-one".