17420838509 has 8 divisors (see below), whose sum is σ = 17458648320. Its totient is φ = 17383070736.

The previous prime is 17420838469. The next prime is 17420838511. The reversal of 17420838509 is 90583802471.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 17420838509 - 2¹² = 17420834413 is a prime.

It is a super-2 number, since 2×17420838509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17420838529) 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, 903164 + ... + 922250.

It is an arithmetic number, because the mean of its divisors is an integer number (2182331040).

Almost surely, 2^17420838509 is an apocalyptic number.

It is an amenable number.

17420838509 is a deficient number, since it is larger than the sum of its proper divisors (37809811).

17420838509 is a wasteful number, since it uses less digits than its factorization.

17420838509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21019.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 17420838509 in words is "seventeen billion, four hundred twenty million, eight hundred thirty-eight thousand, five hundred nine".