19788049 has 4 divisors (see below), whose sum is σ = 19859764. Its totient is φ = 19716336.

The previous prime is 19788047. The next prime is 19788061. The reversal of 19788049 is 94088791.

It is a happy number.

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 9193024 + 10595025 = 3032^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 19788049 - 2¹ = 19788047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19788047) 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, 35442 + ... + 35995.

It is an arithmetic number, because the mean of its divisors is an integer number (4964941).

Almost surely, 2^19788049 is an apocalyptic number.

It is an amenable number.

19788049 is a deficient number, since it is larger than the sum of its proper divisors (71715).

19788049 is an equidigital number, since it uses as much as digits as its factorization.

19788049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71714.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 19788049 is about 4448.3759957989. The cubic root of 19788049 is about 270.4794817947.

The spelling of 19788049 in words is "nineteen million, seven hundred eighty-eight thousand, forty-nine".