17949780239 has 4 divisors (see below), whose sum is σ = 18528805440. Its totient is φ = 17370755040.

The previous prime is 17949780227. The next prime is 17949780283. The reversal of 17949780239 is 93208794971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93208794971 = 103 ⋅904939757.

It is a cyclic number.

It is not a de Polignac number, because 17949780239 - 2¹⁶ = 17949714703 is a prime.

It is a super-2 number, since 2×17949780239² (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 (17949785239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289512554 + ... + 289512615.

It is an arithmetic number, because the mean of its divisors is an integer number (4632201360).

Almost surely, 2^17949780239 is an apocalyptic number.

17949780239 is a deficient number, since it is larger than the sum of its proper divisors (579025201).

17949780239 is an equidigital number, since it uses as much as digits as its factorization.

17949780239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579025200.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 17949780239 in words is "seventeen billion, nine hundred forty-nine million, seven hundred eighty thousand, two hundred thirty-nine".