19225209 has 16 divisors (see below), whose sum is σ = 26634240. Its totient is φ = 12326160.

The previous prime is 19225201. The next prime is 19225223. The reversal of 19225209 is 90252291.

It is not a de Polignac number, because 19225209 - 2³ = 19225201 is a prime.

It is a super-2 number, since 2×19225209² = 739217322187362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19225201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7164 + ... + 9474.

It is an arithmetic number, because the mean of its divisors is an integer number (1664640).

Almost surely, 2^19225209 is an apocalyptic number.

It is an amenable number.

19225209 is a deficient number, since it is larger than the sum of its proper divisors (7409031).

19225209 is a wasteful number, since it uses less digits than its factorization.

19225209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 19225209 is about 4384.6560868556. The cubic root of 19225209 is about 267.8903213860.

The spelling of 19225209 in words is "nineteen million, two hundred twenty-five thousand, two hundred nine".