19472209 has 2 divisors, whose sum is σ = 19472210. Its totient is φ = 19472208.

The previous prime is 19472203. The next prime is 19472231. The reversal of 19472209 is 90227491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 5760000 = 3703^2 + 2400^2 .

It is an emirp because it is prime and its reverse (90227491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19472209 - 2⁵ = 19472177 is a prime.

It is not a weakly prime, because it can be changed into another prime (19472203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9736104 + 9736105.

It is an arithmetic number, because the mean of its divisors is an integer number (9736105).

Almost surely, 2^19472209 is an apocalyptic number.

It is an amenable number.

19472209 is a deficient number, since it is larger than the sum of its proper divisors (1).

19472209 is an equidigital number, since it uses as much as digits as its factorization.

19472209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 19472209 is about 4412.7326001017. The cubic root of 19472209 is about 269.0327024084.

The spelling of 19472209 in words is "nineteen million, four hundred seventy-two thousand, two hundred nine".