17949959 has 4 divisors (see below), whose sum is σ = 18730416. Its totient is φ = 17169504.

The previous prime is 17949949. The next prime is 17949973. The reversal of 17949959 is 95994971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95994971 = 17 ⋅5646763.

It is a cyclic number.

It is not a de Polignac number, because 17949959 - 2⁸ = 17949703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17949959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17949929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390194 + ... + 390239.

It is an arithmetic number, because the mean of its divisors is an integer number (4682604).

Almost surely, 2^17949959 is an apocalyptic number.

17949959 is a deficient number, since it is larger than the sum of its proper divisors (780457).

17949959 is an equidigital number, since it uses as much as digits as its factorization.

17949959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780456.

The product of its digits is 918540, while the sum is 53.

The square root of 17949959 is about 4236.7391942389. The cubic root of 17949959 is about 261.8310537953.

The spelling of 17949959 in words is "seventeen million, nine hundred forty-nine thousand, nine hundred fifty-nine".