17920939 has 4 divisors (see below), whose sum is σ = 17929656. Its totient is φ = 17912224.

The previous prime is 17920909. The next prime is 17920993. The reversal of 17920939 is 93902971.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93902971 = 5779 ⋅16249.

It is a cyclic number.

It is not a de Polignac number, because 17920939 - 2¹⁷ = 17789867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17920909) 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 3 ways as a sum of consecutive naturals, for example, 627 + ... + 6019.

It is an arithmetic number, because the mean of its divisors is an integer number (4482414).

Almost surely, 2^17920939 is an apocalyptic number.

17920939 is a deficient number, since it is larger than the sum of its proper divisors (8717).

17920939 is an equidigital number, since it uses as much as digits as its factorization.

17920939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8716.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 17920939 is about 4233.3130052005. The cubic root of 17920939 is about 261.6898754663.

The spelling of 17920939 in words is "seventeen million, nine hundred twenty thousand, nine hundred thirty-nine".