19472387 has 4 divisors (see below), whose sum is σ = 21242616. Its totient is φ = 17702160.

The previous prime is 19472357. The next prime is 19472393. The reversal of 19472387 is 78327491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19472387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19472347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885098 + ... + 885119.

It is an arithmetic number, because the mean of its divisors is an integer number (5310654).

Almost surely, 2^19472387 is an apocalyptic number.

19472387 is a deficient number, since it is larger than the sum of its proper divisors (1770229).

19472387 is a wasteful number, since it uses less digits than its factorization.

19472387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770228.

The product of its digits is 84672, while the sum is 41.

The square root of 19472387 is about 4412.7527689641. The cubic root of 19472387 is about 269.0335221694.

It can be divided in two parts, 1947 and 2387, that added together give a palindrome (4334).

The spelling of 19472387 in words is "nineteen million, four hundred seventy-two thousand, three hundred eighty-seven".