17982942391 has 8 divisors (see below), whose sum is σ = 18489538368. Its totient is φ = 17479584000.

The previous prime is 17982942389. The next prime is 17982942401. The reversal of 17982942391 is 19324928971.

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 17982942391 - 2¹ = 17982942389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17982942371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798130 + ... + 820351.

It is an arithmetic number, because the mean of its divisors is an integer number (2311192296).

Almost surely, 2^17982942391 is an apocalyptic number.

17982942391 is a deficient number, since it is larger than the sum of its proper divisors (506595977).

17982942391 is a wasteful number, since it uses less digits than its factorization.

17982942391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618793.

The product of its digits is 1959552, while the sum is 55.

The spelling of 17982942391 in words is "seventeen billion, nine hundred eighty-two million, nine hundred forty-two thousand, three hundred ninety-one".