19402209209 has 8 divisors (see below), whose sum is σ = 19464001920. Its totient is φ = 19340460256.

The previous prime is 19402209187. The next prime is 19402209217. The reversal of 19402209209 is 90290220491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19402209209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19402209709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032869 + ... + 1051485.

It is an arithmetic number, because the mean of its divisors is an integer number (2433000240).

Almost surely, 2^19402209209 is an apocalyptic number.

It is an amenable number.

19402209209 is a deficient number, since it is larger than the sum of its proper divisors (61792711).

19402209209 is a wasteful number, since it uses less digits than its factorization.

19402209209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21879.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 19402209209 in words is "nineteen billion, four hundred two million, two hundred nine thousand, two hundred nine".