19719049 has 4 divisors (see below), whose sum is σ = 22536064. Its totient is φ = 16902036.

The previous prime is 19719047. The next prime is 19719061. The reversal of 19719049 is 94091791.

It is a happy number.

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: 94091791 = 47 ⋅2001953.

It is a cyclic number.

It is not a de Polignac number, because 19719049 - 2¹ = 19719047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19719047) 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, 1408497 + ... + 1408510.

It is an arithmetic number, because the mean of its divisors is an integer number (5634016).

Almost surely, 2^19719049 is an apocalyptic number.

It is an amenable number.

19719049 is a deficient number, since it is larger than the sum of its proper divisors (2817015).

19719049 is an equidigital number, since it uses as much as digits as its factorization.

19719049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817014.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 19719049 is about 4440.6135837292. The cubic root of 19719049 is about 270.1647325775.

The spelling of 19719049 in words is "nineteen million, seven hundred nineteen thousand, forty-nine".