19473409 has 2 divisors, whose sum is σ = 19473410. Its totient is φ = 19473408.

The previous prime is 19473397. The next prime is 19473427. The reversal of 19473409 is 90437491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12567025 + 6906384 = 3545^2 + 2628^2 .

It is an emirp because it is prime and its reverse (90437491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19473409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19474409) 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 as a sum of consecutive naturals, namely, 9736704 + 9736705.

It is an arithmetic number, because the mean of its divisors is an integer number (9736705).

Almost surely, 2^19473409 is an apocalyptic number.

It is an amenable number.

19473409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19473409 is an equidigital number, since it uses as much as digits as its factorization.

19473409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 19473409 is about 4412.8685681765. The cubic root of 19473409 is about 269.0382287907.

It can be divided in two parts, 1947 and 3409, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 19473409 in words is "nineteen million, four hundred seventy-three thousand, four hundred nine".