19487434 has 4 divisors (see below), whose sum is σ = 29231154. Its totient is φ = 9743716.

The previous prime is 19487431. The next prime is 19487459. The reversal of 19487434 is 43478491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15626209 + 3861225 = 3953^2 + 1965^2 .

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 not an unprimeable number, because it can be changed into a prime (19487431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4871857 + ... + 4871860.

Almost surely, 2^19487434 is an apocalyptic number.

19487434 is a deficient number, since it is larger than the sum of its proper divisors (9743720).

19487434 is an equidigital number, since it uses as much as digits as its factorization.

19487434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9743719.

The product of its digits is 96768, while the sum is 40.

The square root of 19487434 is about 4414.4573845491. The cubic root of 19487434 is about 269.1028015570.

The spelling of 19487434 in words is "nineteen million, four hundred eighty-seven thousand, four hundred thirty-four".